Object templates for tile objects

[Cleptomania]

Tile objects do not load properly when loaded from a template. This is because when it comes to templates, the tileset is defined at the template level, and not the map level.

In order to support proper loading of them, the tileset needs to be added into the map object, and have it's firstgid adjusted to work with the rest of the map.

This was found in the Arcade library via pythonarcade/arcade#919

In order to fix this, the map object will need created before the layers are processed, it's hard to say at this point how exactly that will look.

[Cleptomania]

This is done, released in 1.6.0