This PR adds a new TileMap object that can be configured directly in GDevelop.
Import an atlas image, configure the tile size and start painting in the editor!
You can also configure which tiles should have a hit box and use them as platforms.
* Tilemaps made with [LDtk](https://ldtk.io/), a modern 2D level editor, can be now used directly. Make sure to save your map made in LDtk as a JSON file, create a new Tilemap object in GDevelop and in the Tilemap field, choose the LDtk file.
* Tilesets used by the LDtk Tilemap are automatically imported in your game - you don't need to import them separately.
* For more information, read about the [Tilemap object on the wiki](https://wiki.gdevelop.io/gdevelop5/objects/tilemap).
Co-authored-by: Davy Hélard <davy.helard@gmail.com>
Co-authored-by: Florian Rival <Florian.Rival@gmail.com>
* The collision mask is read from the tile maps exported by Tiled 1.9+.
* Several collision masks can be used for instance to have platforms and ladders.
* Take a look to the wiki for more details https://wiki.gdevelop.io/gdevelop5/objects/tilemap
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