* custom device field web display and edit
* make display work; relies on T::T calling dict slot or method with same syntax
* add storing port custom fields
* use resultset method instead, use cf_ prefix
* update Pg min ver for jsonb
* allow override of position and default for port custom fields
* support hidden for custom fields
* update description of Objects API class
* allow left and mid position for custom fields
* add custom fields in csv
* change port control sidebar label
* fix default missing bug on backend jobs
