Missing Imports/Type Annotations #92

ObjectLayer.tiled_objects returns a list of TiledObjects. I'd like to pass this list or an item of this list to a function similar to the following:

def process_tiled_objects(tiled_objects: list[TiledObject]):
    ...

However, TiledObject is not included in __all__ of __init__.py. So, I can't do the following without errors from my IDE:

from pytiled_parser import TiledObject

I can use the following alternatives:

import pytiled_parser.tiled_object

def process_tiled_objects(tiled_objects: list[pytiled_parser.tiled_object.TiledObject]):
    ...

or

from pytiled_parser.tiled_object import TiledObject

def process_tiled_objects(tiled_objects: list[TiledObject]):
    ...

I'd also need access to the subclasses of TiledObject such as Point, Rectangle, Tile, etc to be able to distinguish between them. I can import them like the above. But it seems they should be available from the top level like TiledMap, TileLayer, etc are.

So, what do you think about adding them to __all__ in __init__.py? I can create a PR for it?

However, how should Tile be handled? Tile exists in both tileset.py and tiled_object.py? The one from tiled_object.py could be aliased as TileObject (unfortunately this is very similar to TiledObject and may become confusing) or something else.

Also, should WangColor, WangSet, and WangTile be added to __all__?