Enhance template syntax highlighting

[jpike88]

Loving the work so far, it's in a much better place than last year.

A couple of enhancement ideas:

if possible, itemChosen(), env.isCordova, the number 5 (cornerRadius expects a number), false for the round property (which expects boolean), all items in double brackets should be highlighted in a special way.

[ayazhafiz]

Thanks for the issue. These are known features we are planning to add, kept track in #483. Closing as a dupe of that.

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