Update Build 1.0.21

- Small memory optimizations
- Fixed formatting bug in achievement categories
- Make close button same size as header in available teachers
- Improved audio data files and added new audio
- Fixed vehicles ambient audio implementation.
- Fixed wrong label used in school ranking
- Fixed sick status not showing
- Fixed wrong reports tab color after tutorial
- Fixed missing days on the drop-out deduction Grant.
- Fixed school improvement tutorial - Esc button not working.
- Fixed clicking on notifications blocks the tutorial sequence
- Updated credits for localization
- Fixed missing oval track waypoints data
- Fixed bug where mods installer tries to parse language XML files for school map mods

This release also includes a new way to mod the game. There are hidden objects in the game that can be modified to show a different. In a way, this can be use to kind of add a new object that's not in the vanilla game. Check out the steps on how to do this here.