* max duration per entry increased from 8 to 10 hours
* fixes#3981 - clickable area in dropdown too small
* fixes#4008 - duplicate activities in project-details report
* headers and summary styling in project-details report
* show billable stats in project-details report
* added new invoice variable for entry.duration_format
* prevent too long values for user preferences
* add chart value 0 to y-axis if last value > 0, to always display the zero line (project details)
* add user-preferences to invoice hydrator
* DateTime vs DateTimeInterface
* simplify permission config
* fix query for teamleads limiting to only selected teams not possible
