C# Code Navigation Commands Shouldn't Be Available in HTML

[TanayParikh]

Not entirely sure if this is immediately feasible, but ideally, we shouldn't have these C# commands when right clicking on an HTML area.

[TanayParikh]

We'll need to add support for textDocument/prepareGoToDefinition, textDocument/prepareFindAllReferences & textDocument/preparePeekDefinition requests.

We currently do this for textDocument/prepareRename which is sent ahead of the actual rename to "test the validity of a rename operation at a given location."

Looking into it...