Save the colors and sticker properties to Preferences.
One more bugfix
Change OperatingSystemInterface
Stop crashing when something goes wrong with solvers
Make the touch control in OSInterface more like in the previous version - before it was occasionally crashing...
minor
Move the SharedPreferences to the OSInterface
Start moving the SharedPreferences to the OSInterface
Move opening local files to the OSInterface
Move the interaction with touchscreen to the OSInterface (part3)
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