GenericButton improvements

[eps0003]

Status

READY

Description

New stuff:

• Buttons only display when you are not attached to or inside the inventory of a blob except the one you're interacting with
• Prevented displaying shop buttons while attached to the shop
  • This currently only prevents you from opening the shop while sleeping in a quarters (which you couldn't even buy from while sleeping)
• Made seat arrows not display while inside a blob's inventory (crates)
• Visible buttons are cleared when you attach to a blob or a blob attaches to you
  • Prevents opening a shop menu while attached to a blob (see issue below)

Issues:

• High ping still allows you to open a shop menu while attached to a blob if you're fast
  • This is completely useless though since you can't buy from the shop while riding a siege/boat

Resolves #577
Resolves #600 (comment)

Steps to Test or Reproduce

Tested most CTF shops
Tested sieges, boats and crates
Didn't test TDM ruins, TTH related stuff (factory, scrolls), and wiring components (lever, button, coin slot, etc.) but it uses identical code to everything else so it should be fine

[1bardesign]

Looks fine, there might be some issues with nested includes with this approach but it seems to only be used in top level files as far as I can tell. Definitely will need careful testing on net though to make sure there's no funny business.

[furai]

@eps0003 can you resolve these merge conflicts?

[eps0003]

I swear I left a comment right after my commit. @furai can you check this PR out now that I've resolved the merge conflicts.