lang: Move bytecode to func.c

lang: Add more code documentation

lang: Include types.h in object.h

lang: Handle all object allocation in object.c ...

This makes object a purely opaque type now

lang: Remove useless object cleanup checks ...

Once again we assume that we've gotten here correctly based on class data.

lang: Always place VmState first in function calls

lang: Remove arg_count and rely on stack depth instead

lang: Add opaque types for Object and VmState

lang: Add back reference counting ...

The basic idea here is that we transfer ownership to and form the stack,
and clean up references that way.

lang: Remove checks for obj->class_data ...

I have no idea how these could even trigger.

lang: Drop reference counting, embrace leaking ...

I will add proper garbage collection later

lang: Wrap stack functions

lang: Replace args with a vm_state stack ...

This doesn't have any functional changes at the moment but will
aid in adding proper stack support in the future.

bytecode: Garbage collect the stack ...

This treats the stack itself as a place of references that needs to
be garbage collected and cleaned up. This will allow tail calls later.

lang: Pass arg_count to bytecode_run to aid stack allocation

lang: Fix arg counts to include return value

lang: Implement basic bytecode for returning values

lang: Remove unused references to stdio.h

lang: Introduce func that just returns 1234