Raylib physac library bindings

[AlecTroemel]

Hey ya'll, just wanted to show the raylib physac library bindings I've been working on! The API is pretty small, so hopefully I'll work through it all in the next couple of days.

My C is still pretty rusty, so any feedback is welcome :)

[sogaiu]

@AlecTroemel I guess you moved on to working on bindings for Chipmunk2D -- how has that been?

[AlecTroemel]

@sogaiu haha ya.. I got a pretty strong "dont use physac" from the raylib discord 😆

For chipmunk, I've got far enough for the hello-chipmunk.janet example to run, and started work on joins+constraints. There are some implementation details I'm still trying to figure out, I just created some issues describing all the ones I could think of.

My goal is to have the chipmunk bindings in a somewhat usable state for the Ludum Dare 51 game jam, so you can expect more work soon. And of course any help/tips/PR's are always welcome!