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/vendor/plugins/codemirror/mode/haml/test.js

@@ -0,0 +1,97 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+(function() {
+  var mode = CodeMirror.getMode({tabSize: 4, indentUnit: 2}, "haml");
+  function MT(name) { test.mode(name, mode, Array.prototype.slice.call(arguments, 1)); }
+
+  // Requires at least one media query
+  MT("elementName",
+     "[tag %h1] Hey There");
+
+  MT("oneElementPerLine",
+     "[tag %h1] Hey There %h2");
+
+  MT("idSelector",
+     "[tag %h1][attribute #test] Hey There");
+
+  MT("classSelector",
+     "[tag %h1][attribute .hello] Hey There");
+
+  MT("docType",
+     "[tag !!! XML]");
+
+  MT("comment",
+     "[comment / Hello WORLD]");
+
+  MT("notComment",
+     "[tag %h1] This is not a / comment ");
+
+  MT("attributes",
+     "[tag %a]([variable title][operator =][string \"test\"]){[atom :title] [operator =>] [string \"test\"]}");
+
+  MT("htmlCode",
+     "[tag&bracket <][tag h1][tag&bracket >]Title[tag&bracket </][tag h1][tag&bracket >]");
+
+  MT("rubyBlock",
+     "[operator =][variable-2 @item]");
+
+  MT("selectorRubyBlock",
+     "[tag %a.selector=] [variable-2 @item]");
+
+  MT("nestedRubyBlock",
+      "[tag %a]",
+      "   [operator =][variable puts] [string \"test\"]");
+
+  MT("multilinePlaintext",
+      "[tag %p]",
+      "  Hello,",
+      "  World");
+
+  MT("multilineRuby",
+      "[tag %p]",
+      "  [comment -# this is a comment]",
+      "     [comment and this is a comment too]",
+      "  Date/Time",
+      "  [operator -] [variable now] [operator =] [tag DateTime][operator .][property now]",
+      "  [tag %strong=] [variable now]",
+      "  [operator -] [keyword if] [variable now] [operator >] [tag DateTime][operator .][property parse]([string \"December 31, 2006\"])",
+      "     [operator =][string \"Happy\"]",
+      "     [operator =][string \"Belated\"]",
+      "     [operator =][string \"Birthday\"]");
+
+  MT("multilineComment",
+      "[comment /]",
+      "  [comment Multiline]",
+      "  [comment Comment]");
+
+  MT("hamlComment",
+     "[comment -# this is a comment]");
+
+  MT("multilineHamlComment",
+     "[comment -# this is a comment]",
+     "   [comment and this is a comment too]");
+
+  MT("multilineHTMLComment",
+    "[comment <!--]",
+    "  [comment what a comment]",
+    "  [comment -->]");
+
+  MT("hamlAfterRubyTag",
+    "[attribute .block]",
+    "  [tag %strong=] [variable now]",
+    "  [attribute .test]",
+    "     [operator =][variable now]",
+    "  [attribute .right]");
+
+  MT("stretchedRuby",
+     "[operator =] [variable puts] [string \"Hello\"],",
+     "   [string \"World\"]");
+
+  MT("interpolationInHashAttribute",
+     //"[tag %div]{[atom :id] [operator =>] [string \"#{][variable test][string }_#{][variable ting][string }\"]} test");
+     "[tag %div]{[atom :id] [operator =>] [string \"#{][variable test][string }_#{][variable ting][string }\"]} test");
+
+  MT("interpolationInHTMLAttribute",
+     "[tag %div]([variable title][operator =][string \"#{][variable test][string }_#{][variable ting]()[string }\"]) Test");
+})();