Tower of DLC v0.1.1 (DAI 2.1)

- Fixed title-screen button/icon texture fallback by using Tower-owned GUI icon textures.
- Rebuilt the Core Spire roadway as a continuous aligned 7-wide Light Cycle spiral.
- Added aligned through-spire road crossings at multiple elevations.
- Added native DAI Light Cycle vehicle definition.
- Added Bike Toggle controller to both faction starter loadouts.
- Bike Toggle deploys/mounts on first use and dismounts/dismisses on second use.
- Added cyan/orange Light Cycle frame visuals and automatic visual tracking.
- Added recovery cleanup for manual dismounts.
