Big tilemap/map rework

[Daft-Freak]

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TileMaps being slow and a bit hard to use finally annoyed me enough... Requires https://github.com/32blit/32blit-tools/pull/105 for layer names.

Adds a new TiledMap, which covers most of the functionality of TileMap and Map. (TileMap is kept as a deprecated alias of what is now TransformedTileLayer for some level of compatibility)

New features:

• Can load the 16-bit tile output from the tools
• Also improved handling of multiple layers (don't need to load_tmx each layer, layer names from Tiled)
• Easier (and much faster) support of just scrolling a map
• Removes the power of two bounds and 16 column tileset restrictions unless you specifically request the transformed variant (TiledMap(..., LAYER_TRANSFORMS))
• Doesn't leak memory (at least, if the map allocated it)
• Supports loading maps from files as well as embedded assets

Most basic usage is:

sprites = Surface::load(asset_tileset);
map = new TiledMap(asset_tilemap, sprites);
...
map->set_scroll_position(scroll_position);
...
map->draw();

But also:

// from a file
map = new TiledMap("tilemap.blah", sprites);
// remove COPY_TILES/COPY_TRANSFORMS flags (read-only, less ram)
map = new TiledMap(asset_tilemap, sprites, 0);
// old TileMap behaviour, more restrictions, scanline transforms supported (+ anything other than a translate in general)
map = new TiledMap(asset_tilemap, sprites, COPY_TILES | COPY_TRANSFORMS | LAYER_TRANSFORMS);

For the affected examples:

• flight is now significantly faster (22 -> 12 ms)
• platformer is a little faster (38 -> 36ms)
• raycaster and tilemap-test are about the same

Anything that used Map probably also has a lower memory usage during init due to less copying vectors around.

Has a circular dependency on the examples branch that ports everything. (Deleted the Map code, can't find any uses outside of the three examples using it)

[Gadgetoid]

Niiice! I should drag my brain kicking and screaming back into the world of the productive and try to port Rocks & Diamonds.