Add accessibility features

[louies0623]

Make the handicapped have a good experience.

(If it is difficult to implement, start with invert color)

[probonopd]

Someone would need to hack on the QtPlugin for this. I am unlikely to do it.

[louies0623]

Maybe this site can help.
https://doc.qt.io/qt-5/accessible-qwidget.html

[probonopd]

Someone would need to do this. Not me.