Drop "unrolled/render" package (#23965)

None of the features of `unrolled/render` package is used. 

The Golang builtin "html/template" just works well. Then we can improve
our HTML render to resolve the "$.root.locale.Tr" problem as much as
possible.

Next step: we can have a template render pool (by Clone), then we can
inject global functions with dynamic context to every `Execute` calls.
Then we can use `{{Locale.Tr ....}}` directly in all templates , no need
to pass the `$.root.locale` again and again.

assets/go-licenses.json

@@ -924,11 +924,6 @@
     "path": "github.com/unknwon/com/LICENSE",
     "licenseText": "Apache License\nVersion 2.0, January 2004\nhttp://www.apache.org/licenses/\n\nTERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION\n\n1. 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For the purposes of this definition,\n\"submitted\" means any form of electronic, verbal, or written communication sent\nto the Licensor or its representatives, including but not limited to\ncommunication on electronic mailing lists, source code control systems, and\nissue tracking systems that are managed by, or on behalf of, the Licensor for\nthe purpose of discussing and improving the Work, but excluding communication\nthat is conspicuously marked or otherwise designated in writing by the copyright\nowner as \"Not a Contribution.\"\n\n\"Contributor\" shall mean Licensor and any individual or Legal Entity on behalf\nof whom a Contribution has been received by Licensor and subsequently\nincorporated within the Work.\n\n2. 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If You institute patent litigation against any entity (including a\ncross-claim or counterclaim in a lawsuit) alleging that the Work or a\nContribution incorporated within the Work constitutes direct or contributory\npatent infringement, then any patent licenses granted to You under this License\nfor that Work shall terminate as of the date such litigation is filed.\n\n4. Redistribution.\n\nYou may reproduce and distribute copies of the Work or Derivative Works thereof\nin any medium, with or without modifications, and in Source or Object form,\nprovided that You meet the following conditions:\n\nYou must give any other recipients of the Work or Derivative Works a copy of\nthis License; and\nYou must cause any modified files to carry prominent notices stating that YLine truncated
   },
-  {
-    "name": "github.com/unrolled/render",
-    "path": "github.com/unrolled/render/LICENSE",
-    "licenseText": "The MIT License (MIT)\n\nCopyright (c) 2014 Cory Jacobsen\n\nPermission is hereby granted, free of charge, to any person obtaining a copy of\nthis software and associated documentation files (the \"Software\"), to deal in\nthe Software without restriction, including without limitation the rights to\nuse, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\nthe Software, and to permit persons to whom the Software is furnished to do so,\nsubject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\nFOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\nCOPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\nIN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\nCONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n"
-  },
   {
     "name": "github.com/urfave/cli",
     "path": "github.com/urfave/cli/LICENSE",