As requested in #736, this adds an entry in the settings menu that allows to blacklist certain calendars.
To avoid confusion, all the former blacklist methods and fields have been renamed to apps_blacklist. The new entries are called calendars_blacklist.
Importing the settings has not been tested with the current changes.
Closes#736
Future improvements TODO: The new setting lives in the Pebble section, i believe in the future the blackslist functionality should be centralized and put in the sidebar.
This avoids a lot of problems because java
- does not know unsigned values
- jvm and dalvic do not internally support byte and short
- sqlite does not know them either