Similar in range

This PR adds a new functionality: list selection of all elements of the same type that are in the current range selection.

I have tested the behavior for the following elements:
* spanner
* arpeggio
* chord symbol
* dynamic
* figured bass
* fingering
* fretboard diagram
* glissando
* lyrics
* tremolo

Elements should not have a tick() method at all. Only Segments have a tick value (a position on the time axis)! Ticks are also  bad for several reasons and are only a pragmatic hack. Goal should be to remove them or at least minimize there use.
There is nothing wrong with a crash for methods called in the wrong context :)