Devlog 1.1

Added ability to save and load progress, by collecting coins, saving them to a save slot, and turning the ones you've picked up a different material. It's the same with basketballs, but they reset on level end, forcing the player to collect all in one go if they want them all. The door state can now be loaded and saved, staying open if the player has hit a checkpoint after triggering the door opening. Player location is also saved on walking over checkpoints and is reset to level start if the level is finished.

The basketballs and doors being saved are the two things I did for the homework.