feat: add helper macros for IMGUI menus

[alandtse]

• ADDRESS_NODE: Allows outputting common addresses to clipboard for RE
• BUFFER_VIEWER_NODE: Allows output of buffer data to IMGUI

[doodlum]

I'm unsure if using macros like this could be a problem for debugging. I'm pretty sure these macros can be swapped to standard functions.

For BUFFER_VIEWER_NODE it might need an optional .name field added to each class in that case.

[alandtse]

Name field caused issues with format and runtime strings. Happy to take a PR to add it if you want.

EDIT: I'm not sure what debugging issues you see with the macros so not sure how to address that question.