Merge pull request #39 from vipwolf/master

Added GB Number in settings to filter PN for GB
remove 70
use MahApps.Metro.0.13.0.87-ALPHA
add grid splitter (improves resize performance)
minor render changes
minor flyout style changes
fix selecting next week
update note
Merge pull request #41 from dotob/40-punker76-switch-to-next-week

fix selecting next week
add note for project list pre-filtering
re-filter projekt search list after changing gb number
Merge pull request #42 from dotob/punker76-refilter-projektlist

re-filter projekt search list after changing gb number
Merge with dtobi