Move 3rd party js/css into public/vendor and document sources (#2383)

This commit cherry picks the following commits (master -> v1.2):
  a915a09
  874f9be
  233bbcf

Ref: https://github.com/go-gitea/gitea/issues/1484
Signed-off-by: Michael Lustfield <michael@lustfield.net>

public/vendor/plugins/codemirror/mode/clike/test.js

@@ -0,0 +1,55 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+(function() {
+  var mode = CodeMirror.getMode({indentUnit: 2}, "text/x-c");
+  function MT(name) { test.mode(name, mode, Array.prototype.slice.call(arguments, 1)); }
+
+  MT("indent",
+     "[variable-3 void] [def foo]([variable-3 void*] [variable a], [variable-3 int] [variable b]) {",
+     "  [variable-3 int] [variable c] [operator =] [variable b] [operator +]",
+     "    [number 1];",
+     "  [keyword return] [operator *][variable a];",
+     "}");
+
+  MT("indent_switch",
+     "[keyword switch] ([variable x]) {",
+     "  [keyword case] [number 10]:",
+     "    [keyword return] [number 20];",
+     "  [keyword default]:",
+     "    [variable printf]([string \"foo %c\"], [variable x]);",
+     "}");
+
+  MT("def",
+     "[variable-3 void] [def foo]() {}",
+     "[keyword struct] [def bar]{}",
+     "[variable-3 int] [variable-3 *][def baz]() {}");
+
+  MT("def_new_line",
+     "::[variable std]::[variable SomeTerribleType][operator <][variable T][operator >]",
+     "[def SomeLongMethodNameThatDoesntFitIntoOneLine]([keyword const] [variable MyType][operator &] [variable param]) {}")
+
+  MT("double_block",
+     "[keyword for] (;;)",
+     "  [keyword for] (;;)",
+     "    [variable x][operator ++];",
+     "[keyword return];");
+
+  MT("preprocessor",
+     "[meta #define FOO 3]",
+     "[variable-3 int] [variable foo];",
+     "[meta #define BAR\\]",
+     "[meta 4]",
+     "[variable-3 unsigned] [variable-3 int] [variable bar] [operator =] [number 8];",
+     "[meta #include <baz> ][comment // comment]")
+
+
+  var mode_cpp = CodeMirror.getMode({indentUnit: 2}, "text/x-c++src");
+  function MTCPP(name) { test.mode(name, mode_cpp, Array.prototype.slice.call(arguments, 1)); }
+
+  MTCPP("cpp14_literal",
+    "[number 10'000];",
+    "[number 0b10'000];",
+    "[number 0x10'000];",
+    "[string '100000'];");
+})();