* correctly filter notifications on Api >= 26, other fixes and refactoring
* use correct areNotificationsEnabled method in MainActivity
* change notification led color
* basic implementation
* improve LoginActivity
* darken drawer background image
* add current avatar in ComposeActivity
* add account name to logout dialog
* multi account support for notifications
* multi account support for notifications
* bugfixes & cleanup
* fix bug where somethings notifications would open with the wrong user
* correctly set active account in SFragment
* small improvements