lang: Add module variables

lang: Clarify denominator is always 1 in bytecode

lang: Clean up one-line if statements

lang: Rename number to rational

lang: Add debug logging

lang: Move abort_msg and abort_if to vm

lang: Pass VmState to abort

lang: Couple object functions to VmState ...

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

lang: Add jumps (tail calls) ...

This isn't the cleanest implementation but it works.

lang: Add JUMP_ALWAYS bytecode

lang: Add simple If statements

lang: Document unused OP_DROP_ONE

lang: Rename OP_NULL to OP_NONE

lang: Add booleans

lang: Remove unecessary include

lang: Add a terminator for ending bytecode

lang: Implement Self variable

lang: Pass object to bytecode_run

lang: Move bytecode to func.c

lang: Note that bytecode is auto-generated

lang: Explicitly skip over inline strings

lang: Skip over inline bytecode strings better

lang: Document bytecode.c

lang: Remove unused include

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

lang: Add depth checks to compiler calls

lang: Add depth check bytecode

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