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This shows a numeric display with an API for tracking a position
until released. Once released the node self-animates and frees
itself from its own rendering function. Post-release the node
stops accessing the tracking position, intended for allowing the
associated entity to become reused or discarded immediately upon
release. For this to work smoothly the release must be accompanied
by a storing of the last position within the bonus node via the
provided pointer, which the bonus node's render function then uses
as the origin of its self-animating before destruction.
See comment at start of bonus-node.c for more information/issues.
This only adds the node without integrating into the game, a
subsequent commit will integrate into game.c. Initial impetus
for adding this is making teepee quantities visible.
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