Minimap tile creator

[biosp4rk]

• Added minimap tile creator that can create new minimap tiles based on a MapTile object
• Modified change_minimap_tiles in door_locks.py to create an add new tiles when they don't already exist
  • Uses existing fallback if there are no more blank tiles (but this probably won't happen in practice)
• Blank minimap tile IDs are hardcoded (BLANK_TILE_IDS in minimap_tiles.py)

Fixes #164

[biosp4rk]

Still needs work to account for transparent tiles and item tiles

[Miepee]

Looks fine for me, but would appreciate a look from @duncathan if possible

[duncathan]

iterating over a set is generally inadvisable because the order is not guaranteed

[biosp4rk]

The order does not matter

[duncathan]

if we're trying to maximize open space, then it does matter since otherwise you could end up running out of viable slots for item tiles if you get unlucky enough with the random order you get. it would be much more robust and predictable to iterate over sorted(blank_tile_ids)

[biosp4rk]

It would use the same amount of space whether they're sorted or not. If you look at the code, non-item tiles explicitly check for solitary tiles so that tile pairs are saved for item tiles

[duncathan]

consider a trivial example where you have two item tiles to make and four blank spaces, {0, 1, 2, 3}. if the first item tile happens to land on index 1 first, it'll take up tiles 1 and 2 and there will be no space for the second one

[biosp4rk]

I see now. I don't think it will be an issue in practice but I can change it

addressed