Platforms

- Fixes & Adjustments to Ramp Model (rise rail and dust cover)

- Reworked snow and sand dust accumulation, and added new config options

- Fixed Rain and Snow passing through platforms

Note:
Any platforms that are the topmost block will require a block to be temporally placed above them to force the world to update its heightmap in that column.
This can be skipped for platforms not in snowy areas (or if 'isEnvironmentReactive' is false) and you don't care if rain and snow fall through.