implement agenix

figure out a way to get firefox policies and plugins set up in webapps

fix theme gen for gtk+kde+kvantum - apply defaults/replacements from 
	https://github.com/nana-4/materia-theme/blob/master/change_color.sh
		to
	https://github.com/PapirusDevelopmentTeam/materia-kde/tree/master

is theme gen relevant with cosmic?