Ghidra: Allow FindReferencesToAction in decompiler

[comex]

Is your feature request related to a problem? Please describe.
After selecting a token in the decompiler referring to a global symbol, I would like to be able to find references to that symbol. Currently I have to switch to the listing view to do this.

Describe the solution you'd like
FindReferencesToAction should support decompiler contexts in addition to listing contexts.

Describe alternatives you've considered
It would also be useful to have a shortcut to find references to the current function (as opposed to the contents of the selected token, or even the code address corresponding to the cursor token, which is unlikely to have references).

Additional context
IDA can do this.

[dragonmacher]

The action 'Find uses of xzy' will appear in the Decompiler when right-clicking on a type that has a searchable type.

Finding references to the current function would be a nice addition.

[ryanmkurtz]

Done