Fixes https://gitlab.com/kicad/code/kicad/issues/2343
(The current one keeps pulling the Kicad Manager window to the front on OSX.) I also removed the UpdateUI stuff which was probably causing: Fixes https://gitlab.com/kicad/code/kicad/issues/5049
ADDED Assign Netclass feature to EEschema. Netclass assignments also now shown in status bar. Fixes https://gitlab.com/kicad/code/kicad/issues/4581