Second garbage collector!

Added a second garbage collector! If your app does not contain any cyclic objects and needs high performance, you can now enable the ARC collector!

This garbage collector works by automatically detecting when objects go out of scope and decrementing their reference count, if an object’s reference count goes to 0, it is freed.

This is more performant than the mark and sweep collector because the objects are freed at the moment they are unused instead of stopping the entire program to collect garbage.

This works for all cases, except for cases where there is a cyclic object. Because the cyclic object owns itself, so its reference count is always at 1.