Overhaul the AliceOS Setup assistant (PISA)

[alicerunsonfedora]

The following changes have been implemented to hopefully resolve #15:

• Setup labels are now available in a Pisa class.
• Setup is now dynamically made in the setup label with a new screen: call screen pisa_element("Setup Direction Title", "Setup Directions/Details", extra_info=None, has_back=False, require_input=None, advance_type=0, ok_action=Return(0)).
• Setup assets have been updated to a new look.
• The user interface has been overhauled and closely resembles the mockups.
• Labels no longer overlap each other. Oh, and the text doesn't look as shitty.
• This earned me a Pepe with a heart.

Edit: This will also resolve #19 .

[alicerunsonfedora]

Changes since initial PR

• Setup background now has an Angel on it whereas it didn't before.
• New OEM setting to toggle larger font sizes.
• Input screens in Setup assistant now use AliceOS fonts instead of game fonts (aka. it's not fugly!)