Lags patch

Hi !

I got report that people were experiencing lags, and I finally found what was causing them. There were a problem with Steam Cloud save happening multiple time per second, and I wasn't able to see it in my development environment. So, changes in this update:

- Fix #1406 - Slow FPS on Steam Version
- Fix #1404 - Cannot change Music volume more than once (side effect from previous patch)

Check out roadmap for next updates: https://bugs.dysnomia.studio/projects/alchemistry/roadmap