v1.4.2: added: tooltip addition text on hover

added: tooltip addition text on hover
added: tooltip on click = freeze ghostmap
added: show calculated or sensor RH on tooltip (each sensor) (because of calculation the shown position don't need to be the actual sensor value!)
added: sensor legend
added: Button Show Chart
added: fontscale while zoom
added: zoomlevel to 3
changed: some options are now default true and need to be deactivated (to show all features on startup)
fixed: disable tooltip
fixed: hover bugs
fixed: freeze ghostmap bug
fixed: bar bugs
removed: Ghost icon and made tooltip clickable