Refactor Lua bitwise operations using explicit shim

[alerque]

This is to smooth the way for Lua 5.4 support (see #668 and #929), inspired by discussion here. The bit32 Lua Rock actually tries to be a shim providing Lua 5.2-like functions to Lua 5.1, but it is problematic on newer Lua's that subsequently deprecated that module. It isn't that easy to supply a module when the VM is lying to you about whether the module is already builtin or not.

This explicitly moves all out usage to a shim where we can handle how to shim each version on our own. This will now use bit32 to shim Lua 5.1, but use the built in language operators in Lua 5.3+. These operations aren't technically 100% equivalent, but they work for what we are doing with them.