Bug: Hex TilePos can have its fields equal to map size

[Piturnah]

For a hex tilemap it appears you can get the case where the FilePos is equal to its bounds.

E.g. with TilemapSize { x: 10, y: 10 } you can get TilePos { x: 10, .. } and TilePos { y: 10, .. } after calling fill_tilemap_hexagon

This means that calls to TilePos::within_map_bounds will fail, causing issues such as TilePos::from_world_pos returning None even though there is a tile there.

Link to simple example: repo

In the example, clicking on tiles highlights them. It is expected to work for all tiles, but it does not work for the upper left edge and the right edge, as we have the case described above.