Pix64 v1.2

Howdy,

I'm glad to release a new version of the Pix64 fantasy console. Beside small fixes it introduces support for MacOS and Linux!

The Linux build is untested so any feedback would be welcome. The MacOS build works fine, it's just a bit tricky to get it running (see install instructions at download).

Mandatory changelog:

* Added MacOS and Linux build.
* Play: Fixed bug were two movers could get stuck when colliding together.
* Misc: Added optional program argument to change the carts folder.

Enjoy!