Explosives - Add ability to attach explosives to objects

[DartRuffian]

When merged this pull request will:

• Add a config flag to allow explosives to be placed on any non-unit object (e.g. houses)
  • M112 and the M183 can be attached to objects (vibes based, maybe not the M183 though)
  • This does have issues where units can place/attach explosives inside thin walls (like doors), but this also happens with vehicles anyway
• Add common function to check if something is a terrain object

IMPORTANT

• If the contribution affects the documentation, please include your changes in this pull request so the documentation will appear on the website.
• Development Guidelines are read, understood and applied.
• Title of this PR uses our standard template Component - Add|Fix|Improve|Change|Make|Remove {changes}.

[LinkIsGrim]

SLAMs, demo black might good for object attachable as well

[DartRuffian]

I was gonna do the SLAM but it's rotated 90 degrees so I just left it off

[DartRuffian]

Found an issue while doing some more testing, seems like trying to attach them to terrain objects causes them to be sent to the debug corner Resolved by using a dummy object when attaching to terrain objects

2026-03-10.11-52-50.mp4

[DartRuffian]

Needs docs, but that's easy. Can do that after property name is picked Done

[DartRuffian]

Name was changed to make it clearer, I'm happy with it now