Add week select to week view

changed milestone to %1.0a1

added part::frontend prio::1 labels

mentioned in issue #61 (closed)

assigned to @ZugBahnHof

@ZugBahnHof What's the current status?

created merge request !73 (merged) to address this issue

mentioned in merge request !73 (merged)

closed via merge request !73 (merged)

mentioned in commit b4e21b8d