py: remove dead code

python_payload/apps/captouch_calibrator.py

python_payload/apps/captouch_test.py

python_payload/apps/demo_mandelbrot.py

python_payload/apps/demo_sparabo.py

python_payload/apps/demo_worms.py

python_payload/apps/flow3r/__init__.py

python_payload/apps/flow3r/menu_crazysynth.py

python_payload/apps/flow3r/menu_main.py

python_payload/apps/flow3r/menu_settings.py

python_payload/apps/flow3r/menu_tinysynth.py

python_payload/apps/flow3roids.py