Traffic Simulator

Notable additions/changes:
- Added folder structure to road painter screen.
- Added decimal number support to road paint render layers.
- Added scale option to road paint.
- Added capability to segment road paint lines into more than two segments.
- Improved road paint auto-splitting algorithm.

Notable fixes:
- Fixed passenger skins not loading on servers.
- Fixed road paint not working on servers.
- Fixed dynamic traffic spawning directly in front of other players on a server.
- Fixed crash with vehicles departing from a node on a route with short road segments.
- Fixed bug where pressing arrow keys inside text fields would still move the map background.