Wall mode

[uecasm]

Depends on ldtteam/structurize#486

Changes proposed in this pull request:

• fix translation string in decoration controller "cancel repair/upgrade"
• fix translation string in rally banner gui
• decoration controller repair/upgrade now shows you the list of expected materials and allow custom builder assignment, just like the initial deco build
• make work orders for decoration controller repair/upgrade have a short name instead of the full schematic path
• support for "~wall~ extendable mode" (decorations only) -- see linked Structurize PR for usage
  • an upgradable wall build only gets one decoration controller, which indicates that it's ~a wall~ extended in the gui
• support for PlacementSettings api changes
• adds top-level sections for Roads, Rail, Walls, and Fields (this removes them from the Decorations menu)
• all /walls/ will automatically get the Extendable Mode UI. other schematics (including roads/rails) can only use it if a tag is added (but walls should be updated to use the tag too, so eventually this backwards-compatibility check can be removed)

Review please

Now:

[uecasm]

Rebranding to Extendable Mode based on feedback; moving some mcol-specific compat code to here instead of struct.