Changelog v1.2

This one was mainly about optimizing the development process, so the game itself didn't change a lot.

Changes:

• We have a new music track (but the loop transition needs some work)
• I made a Level Editor (Source Code), which should make development in the future a lot more efficient.
• I set up an automated building process using the tool SuperUnityBuild and it's integration for uploading to itch using butler. This will make it possible to release smaller updates more frequently.
• Finally, I fixed a typo and a lot of bugs introduced by the many changes I made to how the scripts and the level hierarchy are structured.

Next, I'll probably focus on adding a settings menu and finally some new mechanics and levels. I may look into uploading it to Google Play as well.