Added support for multiple fonts.

[johnbatty]

Multiple fonts! (Issue #24)

• pico8
• bbc
• appleII
• cbmII

Fonts based on information from here: https://damieng.com/blog/2011/02/20/typography-in-8-bits-system-fonts

New font definition format. Rewritten text rendering (2x faster than previous version).

New font API function:

    font(<font name>)
    font name = <pico8|bbc|appleII|cbmII>
e.g.
    font("appleII")

Default font is pico8.

Font example app updated to allow flipping through fonts with left/right arrows.

The larger fonts will obviously be more suited to a higher resolution than 128x128.

Enjoy!

[hallucino]

Nice !! It will be super useful !