Persist preferences between app launches #21
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Closes #10.
This PR adds a
colorSchemeIntegerKeykey to UserDefaults for an integer value. When PreferencesModel'sappearanceproperty is set, the new value is stored in UserDefaults.On launch, the WriteFreelyModel sets the PreferenceModel's
appearanceproperty to the value saved in UserDefaults. As this forces an update to the UI, we make sure it happens on the main thread, or else this gets called before the UIWindow has been created on iOS.This persists the user's preference for colour scheme between app launches.