Full-time 4WD for Hopper, Roamer, D/H-series 1.3

Changes:
- Made the transfer case use a new system that switches between modes instead of toggling individual parts.
- Provided unique 4wd controller with it's own key bindings that do not affect default version, and allows toggling previous transfer case mode with alt A, rather than the next mode.
- Made a new differential type to prevent it from being toggled by default diff control, only toggled by appropriate TC mode.
- Updated and fixed various configurations.
- Removed the "Removed low...

- Fixed UI failing to update for the center differential icon
- Added roofs back to the vans, after some vandal decided to cut them off with a corner grinder

- Added a transfercase with adjustable rear torque bias
- Moved all configs from the extra configs mod to this one
- Adjusted values on viscous center differential
- Added a heavy duty viscous and 2 Torsen center differentials (one with locking, one without) as options
- Added a part that replaces rangebox gears, making the vehicle have no low range option, which is used in Speedster. Also removed Speedster's unique TC file as it was made redundant
- Adjusted and fixed all of the configs...

Added:
3 new low range ratios to choose in place of default 2.2 reduction
- 2.72:1
- 3.4:1
- 4:1 (Crawler TC ratio)

Changed:
Transfer case is now a single option, with its own subcategories for center differential and low range gears to avoid cluttering transfer case list.

Fixed:
Fixed the pickup and Roamer transfer case lacking visible mesh

Fixed a minor error causing the UI to show incorrect icons.

Made the viscous locking diff to use lsd icon when unlocked, to fix an issue related to viscous lacking its own icon on ui.

- Made a second, optional transfer case with viscous limited slip differential(VLSD), while still having an ability to lock it.
- Replaced the transfer case with a new one on configurations for Gavril vehicles.