query custom_fields and output them for planning_elements and projects
inserted copyright notice into custom_fields files
output extra fields for WorkPackageCustomField
call work_package planning_element
write custom fields for work packages through API v2
Note: the planning_element_params key order is important (ugh ...)!
'type_id' has to appear before 'custom_fields' for it to work.
test planning element custom field create/update
don't keep standard type around
test custom_field rendering