Subroutine which changes a tile at the current bounce sprite's position.
It can be jumped to the following addresses:
$02919F: The code which loads the currently assigned block the bounce sprite should turn into ($9C format) but also handles on whether a multiple coins block should turn into a used block. This is called when a bounce sprite terminates and becomes a solid block again.
$0291B8: Spawns an invisible solid block. This is called when a bounce sprite has just spawned but also when the bounce sprite collects a coin, leading to the solid air tile glitch.
$0291BA: Spawns a tile in the $9C format with A as the parameter at the bounce sprite's position. This is called from spinning turn blocks when they become solid.
