Marker color: red -> orange, Marker width: 2 -> 1
Removed the lower triangle, thinner upper triangle.
Time tick area background color
Changed the way ticks are displayed
Switched the order of ticks / marker
Convenient test method for markers
Clicking / dragging the time tick area moves the marker position
Better handle notification
Show the time of the current selection
showMarkerAtPosition -> showMarkerAtPixel
showMarker -> showMarkerAtTimestamp
Move the marker to the event position when an event is clicked
The order of events / marker has changed
Context menu consolidated for events and marker
Merge branch 'feature/time_selection' into develop