Added Trakpack3 straight sections 2880, 4864, 5120, 5504, 5632, 7424, 16128, 18368, 18816

Added Trakpack3 straight pieces 16, 8 and 4. Why? Because sometimes you just need that littleeee extra space.

Some missing files

Added two additional pieces for each banked radius (2048 & 3072 variants) that are banked on either end to allow creations of 180 degree turns that are banked.

Added additional 2 banked curves for 2048 radius that allows continuous banking from one side each so that two can be put together to create a 180 radius

Added 8 radius of banked tracks (2048 & 3072 curves) for Trakpack3:
2048, 2240, 2432, 2624, 3072, 3264, 3456, 3648

Added a bunch of mprops ahead of gm_blackprise compile

Added a bunch of mprops ahead of gm_blackprise compile

Added 3 new textures:
rubberconveyorbelt001a_somefric, lowfric, and icy

These three will form part of a new feature in gm_blackprise for conveyor belt and prop spawning usage.

Added woodpile 1 to 5, simple 96x128 size blocks for carrying on freight or as decoration.