Rename make_dtype<T>() to ndt::make_type<T>()
Rename array::get_dtype to array::get_type
Rename 'dtypes' directories to 'types'
Rename dtype_functions to type_functions
Rename array(..., dtype=...) to be array(..., type=...)
Rename dtype_promotion to type_promotion
More dtype/type naming cleanup
Rename print_dtype to print_type
Clean up the rest of dtype -> type usage