Fix Input System Overshadowing

[alaingalvan]

Easy first pull request!

If you're pressing 2 keys that affect the same axis mapping, one can overshadow the other when releasing keys. Could be solved w/ a u8 with each bit mapped to if an input is active or bool array.

A u8 would limit the input map to only accept a max of 8 axis bound values, which honestly sounds like more than enough, and could mean the vector sizes of the input map are known at compile time, boosting performance.

[alaingalvan]

I'll reopen this issue when we get back to it. 👍