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GridWorld.grid uses a (y, x) coordinate system while all the object.location parameters of objects return (x, y) tuples #332

Description

@noopynolife

Describe the bug
GridWorld.grid uses a (y, x) coordinate system while all the object.location parameters of objects in Matrx return (x, y) tuples.

To Reproduce
Perform a object_ids = Grid_world.grid[obj.location] call on an env_object obj where obj.location[0] != obj.location[1].

On inspection, object_ids will not include the env_object obj, because we effectively asked the grid_world to search (obj.location[1], obj.location[0]).

Expected behavior
It is expected that Grid_world.grid[obj.location] shows all object_ids that are registered at the location of the object.

Additional context
@thaije suggested I use search the State object instead, which I'll happily do, though that does not address the counterintuitive coordinate system of .grid

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