Feature: Add support for bars over text

[FromenActual]

trafficstars

SparkFun's Buzzard plugin allows for bars over text to indicate inverted pins, here's an example product with a couple inverted labels (MCS and ACS):

Far as I can tell, there's no way to do it with KiBuzzard yet:

Would be a great addition for feature parity!

[ilium007]

Would be great to see this in the original plugin!

[gregdavill]

This is now a feature thanks to #108