Converting build mode to use decls.

[MistakeNot4892]

Description of changes

• Converts build mode click interactions to use decl handlers.
• Removes the ladder build mode as ladders no longer function point to point.
• Merges move_into and relocate_to into one mode.

Why and what will this PR improve

Very old and crusty code. Makes it more modular and able to be expanded without overrides.

TODO

• [X] Conversion.
• [x] Testing.

Authorship

Myself.

Changelog

:cl: admin: Build mode ladders have been removed, and build mode relocate and move have been merged. /:cl:

[MistakeNot4892]

All appears to be working.