add icons

conf/images/icons/dezoom.png

conf/images/icons/extent-01.png

conf/images/icons/extent-02.png

conf/images/icons/grid.png

conf/images/icons/image.png

conf/images/icons/label.png

conf/images/icons/map.png

conf/images/icons/map_comparative.png

conf/images/icons/right-from-bracket-solid.svg

conf/images/icons/ruler.png

conf/images/icons/shape.png

conf/images/icons/snap.png

conf/images/icons/symbol.png

conf/images/icons/zoom.png