game.p8.png support?

[pancelor]

should we support importing PNG carts?

considerations

• dazzle factor, "it just works"
  • (pro) less friction if the png cart happens to be amenable to conversion (no warnings)
  • (con) less friction; p8x8 is definitely "some assembly required", and asking the user to do some work (re-export the cart as text, using pico8 or shrinko8) seems like a good first step
• (con) if the png cart produces warnings when converted, how is the user supposed to edit the cart's code? by re-exporting it as text anyway, right? most carts will require some changes -- in particular, the symbols you get in PICO-8 when you hold shift and press a letter (like btn(❎)) need to be changed
• (con) extra features = extra code to maintain

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if we decide to support this, we should look at shrinko8's implementation for any edge cases -- for instance, there appear to be 2 separate versions of the .p8.png encoding format