[Game Maker] Slope Physics Engine UPDATE v1.4.0.0

Finished! Not the final release, but the entire engine is in working order! All bugs are fixed, all features are added, all that is left is code cleanup and packaging!Of course I expect there to be a few bugs found later on (almost all to do with the moving platforms (uggh...)), but any that arise should be easy to fix, and shouldn't be game breaking.

Source code (.gmz):
Physics+engine+1.4.0.0.gmz

Windows (.exe):
Physics-Engine-Default-1.4.0.0.exe


Update logs:

1.3.0.1 log:
New Features:
    - Dynamic/dynamic collisions

Tweak: Moving platforms now have better velocity calculation in some situations.

Note: Just some minor changes, the dynamic/dynamic collisions still need better velocity calculation.
1.0.3.2 log:
New Features:
    - Dynamic/dynamic collision physics
    - More directional-through platform options

Bug Fix: Platforms now allow full slope calculation if created with dual axis collisions (can collide from right and top, left and top, right and bottom, etc.)

Note: Very close to final release, just need to fix some bugs and it's done!
1.4.0.0 log:
New Features:
    - Even more directional-through platform options

Tweak: Better dynamic/dynamic collision physics (friction with dynamic/dynamic)

Bug Fix: Platforms now allow full slope calculation if created with dual axis collisions (can collide from right and top, left and top, right and bottom, etc.

Note: Code is still a mess, but the engine works the way it should.