Use new syntax highlighting engine from zyedidia/highlight

This changes all the syntax files in the runtime directory and also
changes how syntax highlighting is done from inside micro.

runtime/syntax/javascript.yaml

@@ -0,0 +1,42 @@
+filetype: javascript
+
+detect:
+    filename: "\\.js$"
+
+rules:
+    - constant.number: "\\b[-+]?([1-9][0-9]*|0[0-7]*|0x[0-9a-fA-F]+)([uU][lL]?|[lL][uU]?)?\\b"
+    - constant.number: "\\b[-+]?([0-9]+\\.[0-9]*|[0-9]*\\.[0-9]+)([EePp][+-]?[0-9]+)?[fFlL]?"
+    - constant.number: "\\b[-+]?([0-9]+[EePp][+-]?[0-9]+)[fFlL]?"
+    - identifier: "[A-Za-z_][A-Za-z0-9_]*[[:space:]]*[(]"
+    - statement: "\\b(break|case|catch|continue|default|delete|do|else|finally)\\b"
+    - statement: "\\b(for|function|get|if|in|instanceof|new|return|set|switch)\\b"
+    - statement: "\\b(switch|this|throw|try|typeof|var|void|while|with)\\b"
+    - constant: "\\b(null|undefined|NaN)\\b"
+    - constant: "\\b(true|false)\\b"
+    - type: "\\b(Array|Boolean|Date|Enumerator|Error|Function|Math)\\b"
+    - type: "\\b(Number|Object|RegExp|String)\\b"
+    - statement: "[-+/*=<>!~%?:&|]"
+    - constant: "/[^*]([^/]|(\\\\/))*[^\\\\]/[gim]*"
+    - constant: "\\\\[0-7][0-7]?[0-7]?|\\\\x[0-9a-fA-F]+|\\\\[bfnrt'\"\\?\\\\]"
+
+    - constant.string:
+        start: "\""
+        end: "\""
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - constant.string:
+        start: "'"
+        end: "'"
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - comment:
+        start: "//"
+        end: "$"
+        rules: []
+
+    - comment:
+        start: "/\\*"
+        end: "\\*/"
+        rules: []