[NRY] Merge in colony-luajit branch.

The colony-luajit branch is a fork of LuaJIT 2.0 that supports colony-like semantics with the LJ_COLONY flag. This branch currently only passes tests on PC with JIT disabled. An experimental branch will support Thumb, and future bugfixes will allow the JIT to be enabled on PC.

This branch brings runtime up to speed, except for line number / bytecode compilation which is disabled.