[2/2] Base: notification drawer: custom clock & calendar shortcuts. Also bring back PA implement when this feature is disabled

OmniGears: https://gerrit.omnirom.org/#/c/4810/

PS9:
fix for multi-user

Change-Id: I941cdebde0b9d90c92f83df9e44f40bb4d4cce63

PS4: re-add imports
PS6: remove dup line
PS:7: readd needed stuff

Change-Id: I941cdebde0b9d90c92f83df9e44f40bb4d4cce63