A lot of bugfixes.

Thanks to all the people reporting those and making me aware of those issues. This really helps a lot!

• Fix a formatting issue in the brush info
• Fix wrong command when clicking on the back button in the preset info
• Fix back button going back to brush presets instead of presets in the brush preset info
• Fix race condition in the rendering mechanic causing it to stop working in rare cases
• Fix exception on startup when a number in a schematic name is larger than the max integer value
• Fix removing a set going back to overview instead of the set list
• Fix presets and brush names not recognized with yaml storage when using upper case names