existance of the BlockAlarmAttribute != blocking alarms

Check if all alarms are blocked, to activate the checkeckbox "block
reminders locally". Background is, that we have to descide, if an user
has set this value by his own or not.

KOLAB: #3731
Merge remote-tracking branch 'kolab/dev/disable_notifications' into kolab/integration/4.13.0
default color of subcalendars same as the person folder

KOLAB: #3624