Add support for Red (exercism fork) (#12)

* Add support for Red

* Disable Red/System files, conflict with Redscript language

languages.json

@@ -1251,6 +1251,12 @@
       "multi_line_comments": [["<!--", "-->"], ["@*", "*@"]],
       "extensions": ["cshtml"]
     },
+    "Red": {
+      "line_comment": [";"],
+      "multi_line_comments": [["comment [", "]"], ["comment {", "}"]],
+      "quotes": [["\\\"", "\\\""], ["{", "}"]],
+      "extensions": ["red"]
+    },
     "Redscript": {
       "name": "Redscript",
       "line_comment": ["//", "///"],

tests/data/red.red

@@ -0,0 +1,20 @@
+Red [] ; 20 lines 10 code 6 comments 4 blanks
+
+x: 1 ; line comment 1
+x: 2   ;-- line comment 2
+x: 3		;@@ line comment 3
+
+comment ['this
+	'is 'multiline
+	'comment]
+comment {and this
+	as well}
+
+function add100 [x [integer!]] [
+	"; this should not count as comment "
+	{ comment [and neither
+	 this] }
+]
+
+comment   {unfortunately, tokei does not allow regexp in comment prefix}
+; so probably previous block comment is not parsed properly