* 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
* cleanup invoice templates
* cleanup invoice translations
* fix invoice datetime for now
* support invoice archive order by number and status
* bump version
* allow meta-field sub-classing
* removed unused translation task.delete
* prevent null in str_replace
- Fixed: mandatory fields / form validation for invoice template
- Added: Duration as calendar title replacer (open: running records)
- Fixed: HTML injection in Calendar
- Fixed: Doctrine Proxies are not initialized (leads to empty customer/project)
- Fixed: tag creation
- Fixed: validation errors do not need to be logged in prod
- Removed: Customer VCard download, as used library is outdated and not maintained
- Added: supporting translations domains in many new places (menu, help_text, page_setup, report, exporter, calendar)
