Separate lua dependency from alloutil

On the heels of the json parser switch, this is the more drastic pull request. This is an extremely naive (but working) method of separating out modules that aren't required by the AlloSphere out of alloutil. This initial version removes the lua dependency from alloutil.

TODO:
- [ ] Update AlloSphere content to point to `alloaux/alloaux/al_Lua.hpp` instead `alloutil/alloutil/al_Lua.hpp`.