Update 1.3.3f

Added a reset purchases option to the settings menu. This removes all items and stat points, and gives the player credits for every completed mission. - saves/progress.json backup files will only be created once per session, rather than every time the game saves. - Some note colors are more saturated. - Hold notes are more opaque. - Hold notes flash slightly while being held. - There is a marker at the end of column hold notes to show that the player should let go at the end. - Added a note flash effect when completing a column note hold successfully. - Removed the flashing particle at the beginning of zig zag hold notes. - Song editor: added a shortcut key for setting zig zag size: Shift-Z. - Added friction sparks to rigs that shoot out either forwards or backwards when being slowed or when accelerating. - Some rig effects like friction sparks now also happen in score mode. - Fixed some visible gaps between track models. - Added a water color override option to the edit world menu in the world editor.