BUILD Engine-styled movement for Ashes addon

Modifies the movement of Ashes to be less slippery, making it more like Duke Nukem 3D!
Credits to Nash Muhandes and Can't Sleep for the code.

Changelog:

v1.1
- Modified the movement code for Afterglow. Previously, the code broke the Bugdog, making her too fast.

Known Issues:

*When reloading a save, the bike does not seem to work 100% as intended. I've made a minor modification to
the motorcycle code that should circumvent this issue, more or less.
You should be able to clear every jump the game requires you to do, even if the bike is ever so slightly off.