Added recent chords in the dialog of chords' editing

For its own policy FaDiesis aims to make the use of the score editor as quick and agile as possible.

To try to achieve this we added a convenient function to the chord editing dialog: recent chords bar.

Here's how it works: every time a chord is added to the score (only on add, not edit), this chord is remembered in a bar at the bottom of the chords editing dialog. This way it will be possible to re-add it with just one click later in the score.

For a matter of song's "key", it is likely to often use the same chords during a editing session. For this reason allowing to insert by one click the latest chords entered, we believe that are going to make the editing more agile than before.

Just the last 8 chords are remembered. Older ones will be forgotten by the bar as new chords will be remembered.

We hope you enjoy this new feature. Let us know what you think of it through the feedback page!