Roadmap for 0.3 and 0.4

[yeastplume]

Informed by some further thinking and suggestions from @CJLove, this issue is meant to capture a vague roadmap for versions 0.3 and 0.4. Naturally, this is all subject to change, but here are the general goals:

Version 0.3

Goals

• Support tilemap tile rotation
• Support direct import of Tiled .tmx tilemap files

Identified Tasks

• Fix enough of the samples to allow for manual testing and inspection of results against the current emulator (currently underway thanks to Update samples for r37 #21)
• Add support for tile rotation while filling out enough imageset and tilemap integration tests to exercise it (Handle tilemap tile rotations #23)
• Design common Trait(s) for import functions and refactor all import functions into them. Palettes can already be imported from two separate types of file, so take this opportunity to create automated tests that ensure the output from both types of palette import is identical. (Refactor import traits to support future formats #24)
• Add support for .tmx palette import, then imageset import/format, tileset etc until done. At this stage it should be easy to create automated tests that check the results against existing reference output. (Enhancement: support tilemap creation from Tiled #20)

Version 0.4

Goals

• Add preliminary support for sound/music output

Identified Tasks

• Integrate MIDI file import (as obvious starting point for import)
• Determine intermediate format for music and sound output