"Evaluate Macro" code action

[beyarkay]

Feature Request

I've looked at #1734 and #4183 and they're both great, but I'd love to have an "evaluate" macro code action (or alternatively, to be able to view the evaluated macro in the tooltip).

So for example, if I've got #define FOO (1+2) and then later I use FOO, hovering over FOO would show both (1+2) and 3.

This feature would be really handy for me, at work we use a macro to create an error code that has the file and line number embedded in it, and being able to see the error code while stepping through the code would be a massive time saver.