Add setting to set default and global disabled repository units. (#8788)

* Add possibility to global disable repo units.

* Add Default Repo Unit app.ini setting.

* Hide units

* Hide disabled repo units

* Minor fixes

* Indicate disabled units in team settings.

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>

modules/setting/repository.go

@@ -37,6 +37,8 @@ var (
 		DefaultCloseIssuesViaCommitsInAnyBranch bool
 		EnablePushCreateUser                    bool
 		EnablePushCreateOrg                     bool
+		DisabledRepoUnits                       []string
+		DefaultRepoUnits                        []string
 
 		// Repository editor settings
 		Editor struct {
@@ -98,6 +100,8 @@ var (
 		DefaultCloseIssuesViaCommitsInAnyBranch: false,
 		EnablePushCreateUser:                    false,
 		EnablePushCreateOrg:                     false,
+		DisabledRepoUnits:                       []string{},
+		DefaultRepoUnits:                        []string{},
 
 		// Repository editor settings
 		Editor: struct {