Add display module

added 14 commits

368bd858...1a693480 - 12 commits from branch card10:master
15236d4d - Initial display support
be38049b - Move epicardium part into own module, minor fixes

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added 2 commits

1ff2dca8 - Initial display support
a22ed705 - Move epicardium part into own module, minor fixes

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marked as a Work In Progress

added 1 commit

52059d89 - [disp] Add graphic primitives

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unmarked as a Work In Progress

Display primitives work, image drawing todo for when fs is implemented

added 8 commits

52059d89...63cec98c - 5 commits from branch card10:master
22e93692 - Initial display support
af248401 - Move epicardium part into own module, minor fixes
a61a2d5a - [disp] Add graphic primitives

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Hey! Can you please rebase and apply tools/code-style.sh? The only thing you should probably change is that right now, you call update on each API call. I think it makes more sense to only call update from a dedicated epic_display_update() call to improve performance when drawing multiple things. Apart from that, thanks for your work!