show chord sequence

[mathisdt]

In SDB, there is the possibility to enter a chord sequence (which essentially means one or more lines of chords, corresponding to the verse, chorus and bridge parts of the song).

This chord sequence should be displayable also. It should be fixed at the bottom of the screen - the rest of the text (including chords contained in the lyrics) should still scroll. There should be a new entry in the display settings to enable or disable it.