Merge #924

924: Improve show syntax tree r=matklad a=vipentti

This implements some of the features discussed in #820. 

You can now select a range of syntax in a file and then use "Show Syntax Tree" to show its syntax. In addition you can select a range of syntax that is inside a string (typically test cases) and show its syntax as well.

Previous behavior is still available, simply use "Show Syntax Tree" without a selection, and you get the live updating syntax tree. Additionally now the live updating tree will update when the active file is changed. Previously you had to type something in the new file to get the syntax tree to update.

Co-authored-by: Ville Penttinen <[email protected]>

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