Version 1.5.48

Added endpoint POST /workorder/{workorder_id}/schedule/ to add a new schedule for a specific workorder.
Added endpoint PUT /workorder/schedule/{schedule_id} to update an existing schedule for a specific workorder.
/itemunit/: Added POST and PUT endpoints
/workorder/: Add field havestaff to GET endpoints.
/workorder/{workorder_id}/{schedule}: New GET endpoint, to retrieve schedules for a specific workorder.
/customerinvoice/: Added field taxreductionworkhours (POST; PUT; GET) and rowtaxreductionbasis (GET).
/project/: Add field projectstatuscode