* WIP: added basic feature and tests.
* WIP: provide tests are GSI binding of new antenna check
* Fixed issue #579 (perimeter_only mode for antenna check)
* Updated DRC doc for 'perimeter_only'
* First implementation of the perimeter factor for antenna check, unit tests.
* Bugfix and unit tests for GSI binding of new antenna check version.
* DRC integration of perimeter-enabled antenna check.
* Enhanced DRC doc for antenna rule