The note editor should be improved

[ciacob]

Description
These should be considered among the improvements:

• extending the range of the "Pitch" section over one octave (by, say, a 5th), so that the user won't need to wander through the octave settings for common tasks such as octave jumps;

• making the "Pitch" section multi-selectable, so as to allow one to enter trivial chords in one go (or alter them). This will create several "Note" nodes, in bulk. When multiple selection is implemented in MAIDENS, the "Pitch" section inside the Note editor should be able several selected Note nodes that live underneath the same Cluster node.

• color coding the octaves could help;

• dynamically center the "Pitch" section based on the last 8 measures of music in the current Part/Measure/Voice (the weighted average of used pitches will do). Clicking inside the "Octave" section will re-center the Pitch section on "F", and clear accumulated knowledge.