Import support for SDCC + LibCV

[haroldo-ok]

• [x] Implement generation of C code compatible with the version of LibCV supported by '8bitworkshop'
  • [x] Do an initial manual data structure conversion of the structures used by the Arduboy generator;
  • [x] Using the data structures, create the required C code for using the game on LibCV;
  • [x] Load the tiles;
  • [x] Display the background;
  • [x] Display the sprites;
  • [x] Use joypad input to move around;
  • [x] Animate tiles;
  • [x] Collide with background;
  • [x] Interact with sprites;
  • [x] Make the room exits work;
  • [x] Implement title screen and ending;
  • [x] Cleanup the code;
  • [x] Based on the above proof-of-concept, make the converter generate the required data structures:
  • [x] Add placeholder to the GUI;
  • [x] Create unit tests for the required data structures;
  • [x] Implement the generators for the various structures;
  • [x] Put the generator together with the GUI;
  • [x] Some additional manual testing.