Moved vendored js/css into public/vendor and documented sources (#1484) (#2241)

* Cleaning up public/ and documenting js/css libs.

This commit mostly addresses #1484 by moving vendor'ed plugins into a
vendor/ directory and documenting their upstream source and license in
vendor/librejs.html.

This also proves gitea is using only open source js/css libraries which
helps toward reaching #1524.

* Removing unused css file.

The version of this file in use is located at:
  vendor/plugins/highlight/github.css

* Cleaned up librejs.html and added javascript header

A SafeJS function was added to templates/helper.go to allow keeping
comments inside of javascript.

A javascript comment was added in the header of templates/base/head.tmpl
to mark all non-inline source as free.

The librejs.html file was updated to meet the current librejs spec. I
have now verified that the librejs plugin detects most of the scripts
included in gitea and suspect the non-free detections are the result of
a bug in the plugin. I believe this commit is enough to meet the C0.0
requirement of #1534.

* Updating SafeJS function per lint suggestion

* Added VERSIONS file, per request

public/css/gitgraph.css

@@ -1,16 +0,0 @@
-body {font:13.34px/1.4 helvetica,arial,freesans,clean,sans-serif;}
-em {font-style:normal;}
-
-#git-graph-container, #rel-container {float:left;}
-#rel-container {max-width:30%; overflow-x:auto;}
-#git-graph-container {overflow-x:auto; width:100%}
-#git-graph-container li {list-style-type:none;height:20px;line-height:20px; white-space:nowrap;}
-#git-graph-container li .node-relation {font-family:'Bitstream Vera Sans Mono', 'Courier', monospace;}
-#git-graph-container li .author {color:#666666;}
-#git-graph-container li .time {color:#999999;font-size:80%}
-#git-graph-container li a {color:#000000;}
-#git-graph-container li a:hover {text-decoration:underline;}
-#git-graph-container li a em {color:#BB0000;border-bottom:1px dotted #BBBBBB;text-decoration:none;font-style:normal;}
-#rev-container {width:100%}
-#rev-list {margin:0;padding:0 5px 0 5px;min-width:95%}
-#graph-raw-list {margin:0px;}

public/css/github.min.css

@@ -1 +0,0 @@
-.hljs{display:block;overflow-x:auto;padding:.5em;color:#333;background:#f8f8f8}.hljs-comment,.hljs-template_comment,.diff .hljs-header,.hljs-javadoc{color:#998;font-style:italic}.hljs-keyword,.css .rule .hljs-keyword,.hljs-winutils,.javascript .hljs-title,.nginx .hljs-title,.hljs-subst,.hljs-request,.hljs-status{color:#333;font-weight:bold}.hljs-number,.hljs-hexcolor,.ruby .hljs-constant{color:#099}.hljs-string,.hljs-tag .hljs-value,.hljs-phpdoc,.tex .hljs-formula{color:#d14}.hljs-title,.hljs-id,.coffeescript .hljs-params,.scss .hljs-preprocessor{color:#900;font-weight:bold}.javascript .hljs-title,.lisp .hljs-title,.clojure .hljs-title,.hljs-subst{font-weight:normal}.hljs-class .hljs-title,.haskell .hljs-type,.vhdl .hljs-literal,.tex .hljs-command{color:#458;font-weight:bold}.hljs-tag,.hljs-tag .hljs-title,.hljs-rules .hljs-property,.django .hljs-tag .hljs-keyword{color:#000080;font-weight:normal}.hljs-attribute,.hljs-variable,.lisp .hljs-body{color:#008080}.hljs-regexp{color:#009926}.hljs-symbol,.ruby .hljs-symbol .hljs-string,.lisp .hljs-keyword,.tex .hljs-special,.hljs-prompt{color:#990073}.hljs-built_in,.lisp .hljs-title,.clojure .hljs-built_in{color:#0086b3}.hljs-preprocessor,.hljs-pragma,.hljs-pi,.hljs-doctype,.hljs-shebang,.hljs-cdata{color:#999;font-weight:bold}.hljs-deletion{background:#fdd}.hljs-addition{background:#dfd}.diff .hljs-change{background:#0086b3}.hljs-chunk{color:#aaa}

public/css/semantic-2.2.1.min.css

@@ -1,11 +0,0 @@
- /*
- * # Semantic UI - 2.2.1
- * https://github.com/Semantic-Org/Semantic-UI
- * http://www.semantic-ui.com/
- *
- * Copyright 2014 Contributors
- * Released under the MIT license
- * http://opensource.org/licenses/MIT
- *
- */
-*,:after,:before{box-sizing:inherit}html{box-sizing:border-box;font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}input[type=text],input[type=email],input[type=search],input[type=password]{-webkit-appearance:none;-moz-appearance:none}article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block;vertical-align:baseline}audio:not([controls]){display:none;height:0}[hidden],template{display:none}a{background:0 0;color:#4183C4;text-decoration:none}a:active,a:hover{outline:0}abbr[title]{border-bottom:1px dotted}b,optgroup,strong{font-weight:700}dfn{font-style:italic}mark{background:#ff0;color:#000}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}img{border:0}svg:not(:root){overflow:hidden}figure{margin:1em 40px}hr{height:0}pre,textarea{overflow:auto}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}button,input,optgroup,select,textarea{color:inherit;font:inherit;margin:0}button{overflow:visible}button,select{text-transform:none}button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}input{line-height:normal}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{height:auto}input[type=search]{-webkit-appearance:textfield}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}legend{border:0;padding:0}table{border-collapse:collapse;border-spacing:0}td,th{padding:0}body,html{height:100%}html{font-size:14px}body{margin:0;padding:0;overflow-x:hidden;min-width:320px;background:#FFF;font-family:Lato,'Helvetica Neue',Arial,Helvetica,sans-serif;font-size:14px;line-height:1.4285em;color:rgba(0,0,0,.87);font-smoothing:antialiased}h1,h2,h3,h4,h5{font-family:Lato,'Helvetica Neue',Arial,Helvetica,sans-serif;line-height:1.2857em;margin:calc(2rem - 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public/css/themes/github/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2012-2016 GitHub, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.