Structured function signature editor

What is the feature you'd like to have?
I want a GUI for editing a function's signature that lets me specify parameters without needing to type the entire function using C syntax.

Is your feature request related to a problem?

• C syntax is strange and can be difficult when using function pointers: #7391 #2294
• Function signatures with many parameters can get very long and editing them in a text box is annoying
• Specifying parameter locations can be tricky with the unconventional format (and people often don't realize it's possible)
• Sometimes editing parameters causes other parameters to change location and that is annoying

Are any alternative solutions acceptable?
Unlikely, as the need for this feature comes from a dissatisfaction with the text box entry as it exists currently.

Additional Information:
This probably should go on the Edit Function Properties dialog. Also, it is worth looking into Ghidra's function signature editor to see what functionality they expose.

Start by reviewing the existing Edit Function Properties dialog and the current text-box signature entry described in the issue. Compare the requested parameter editing workflow with Ghidra's function signature editor to define the supported functionality and acceptance criteria. Done means users can specify and adjust parameters without entering the complete C-style signature.