Add "net tie" for PCB trace antennas
See also kicad/code/kicad#6860 (closed)
PCB trace antennas always fail DRC when connected, because their copper is too close to the connecting traces. We can fix this by putting "net tie" in the keywords.
Affected footprints: Texas_SWRA117D_2.4GHz_Left Texas_SWRA117D_2.4GHz_Right
in library RF_Antenna
Edited by Mark R