Caricate Iconics 16x16 black, Aggiunto script set_gui_preset

        modified:   app/main/_filter_view/30_navigation_bs.lua
	modified:   app/main/_layout/m5s_bs.html
	modified:   app/main/area/_head_ext_bs.lua
	modified:   app/main/area/filters_bs.lua
	modified:   app/main/unit/show_ext_bs.lua
	new file:   extras/set_gui_preset.sh
	new file:   static/iconic-black-16x16.css
	new file:   static/iconic-black-16x16.png
	deleted:    static/iconic-white-24x24.css
	deleted:    static/iconic-white-24x24.png
	modified:   static/m5s_bs.css