Adjust the statusbar item widths according to HiDPI scaling factor

Change-Id: Id697b3b799c7437d937de6534edf88083e5c4dfd
HiDPI: ViewLayout statusbar - scale icons by both dimensions

Change-Id: Ibd8417e0f3daf17d94b5c13e4efcab20568e2153
Cleanup zoomsliderctrl & viewlayoutctrl

Change-Id: Ie5f135e8457ed75146328a388f3b70273bf54ed2