[scala mode] Add enum

Enums are available in Dotty and soon will be available in Scala.

Author: MasseGuillaume

mode/clike/clike.js

@@ -515,8 +515,8 @@ CodeMirror.defineMode("clike", function(config, parserConfig) {
       "StringBuffer System Thread ThreadGroup ThreadLocal Throwable Triple Void"
     ),
     multiLineStrings: true,
-    blockKeywords: words("catch class do else finally for forSome if match switch try while"),
-    defKeywords: words("class def object package trait type val var"),
+    blockKeywords: words("catch class enum do else finally for forSome if match switch try while"),
+    defKeywords: words("class enum def object package trait type val var"),
     atoms: words("true false null"),
     indentStatements: false,
     indentSwitch: false,