[cwconfig] Add optional configuration param to load a UI cube before other cubes
Needed later on to load UI cubes such as legacyui, and one day squareui.
from os.path import join
assert __file__.endswith(join('scripts', 'script3.py')), __file__
assert '__main__' == __name__, __name__
assert ['-vd', '-f', 'FILE.TXT'] == __args__, __args__