Merge calendar and subscription list

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

Alternative design with calendar-icon

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

Move new calendar to bottom of list

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

Reset new calendar menu on close

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

use actions instead of counter

Signed-off-by: Georg Ehrke <developer@georgehrke.com>