āœ‹ Implementing dragging tile

Eventually we want to create shapes of 3 tiles which we drag around and can drop. Let's start with some basic dragging behaviour.

šŸ’» Convert PosScreen to PosHex to map where to drag to
šŸŒæ Add Draggable component (and a test tile)
šŸ¤ Dragging system

#rustlang #gamedev

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