Progress: featureless make

Progress: featureless make

Fix a mistake in the naming conflict for with the language enum and language defines.

Implement a more generic build copy function.
Improve file copying support.
Add verbose copy messages.
Copy the C and C++ header files.
Rename fake_build_settings to fake_build_setting to properly follow this projects naming convention.
Add missing dependency for fl_directory.

Language-specific support setting "build_language" is implemented and provides a way to specific which language to use.
This will default to C.