lang: Pass VmState to abort

lang: Couple object functions to VmState ...

This is needed for coupling abort() to VmState and stack traces.

lang: Add looping test

lang: Add simple If statements

lang: Use object_none() instead of NULL

lang: Add None objects to the language

lang: Add booleans

lang: Replace func with dynamically compiled module ...

I did some tweaking to the style of the generated bytecode but otherwise
this is basically merging func.c in to compile.py. Seems to work for now.

lang: Add a 'none' object to replace NULL uses

lang: Fix typo

lang: Check values since we're kind of testing anyway

lang: Always place VmState first in function calls

lang: Add opaque types for Object and VmState

lang: Handle vm_state creation in vm

lang: Switch to callee cleanup of non-return arguments ...

This simplifies calling things and will allow proper tail calls.

lang: Create vm state once in main

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.

vm: Add stack pushing and popping

lang: Rename vm.stack to vm.stack_next

lang: Add stack bases to vm

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.

lang: Fix arg counts to include return value

lang: Pass NULL values to calls first instead of later ...

This looks a bit awful right now but will be important later on
when we add proper support for calls in bytecode.

lang: Remove OP_DROP since we clean up when returning anyway

lang: Put return value as new args ...

This avoids the dispatch having to free values.

lang: Add OP_DROP to bytecode

lang: Introduce func that just returns 1234

lang: Return values in args ...

This allows multiple return values which makes things a lot easier.