Start of rollingstock #TrainsInMotion (and the 1.7 TC rewrite)

Github is giving me issues today, so I'll be uploading today's changes tomorrow, or whenever I get it working again. But meantime, here's the changelog from today.

- Added a new function to the render to better support models made with SMP Toolbox.
- Added a new passenger car, made by me this time. The model is still unfinished and untextured. The raw model file is included alongside the java model used in-game.
- We will be changing the style of wheels to follow a design more similar to railroad tycoon 3, to fix a depth issue with the models (it also lowers cube/polygon count significantly while improving image quality).
- Added a missing line of documentation to the render.
- Fixed a crash with the bogies.
- Fixed a crash with the tanks and NBT saving.

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