This is another subpart split out of my misguidedly oversized #1625 (setup.py) pull request.

Changes:

• Adds --blacklist option that prevents recipes/packages from being added even though they are in the depends of recipes or otherwise added
• Makes the following modules included per default: android (via bootstrap.py dependency of all bootstraps), openssl/libffi/sqlite3 (via python3 recipe dependency)
• Documents --blacklist option and that android is now included by default
• Cleans up the packaging kivy/sdl2 apps part in the Quickstart section a little