Remove custom metaprogramming containers.
Add arg conversion to callable, overload
Remove meta.hpp from CMakeLists
Start switching naming conventions: PyPtr, TypeInfo
Switch naming convention: Module
Rename any->Any
Massive rename and reorganization.
Cleanup module/capsule relationship (needs testing)
Remove ArgDef header; just use vector of strings with no default args for now
Added name demangling to TypeInfo
Overhaul of overload resolution
Fix capitalization change missed in previous sweep.
Add default converters for int, float types.
Start unit tests for callables; just tests compilation so far.