Set colour intensity proportional to note velocity for easier editing

[m-m-adams]

Makes the note velocity editor more useful by making velocities visible at a glance. Low velocity notes get closer to the tail colour and only max velocity notes show as the full note on colour

[github-actions[bot]]

Test Results

103 tests  ±0   103 :white_check_mark: ±0   0s :stopwatch: ±0s  15 suites ±0     0 :zzz: ±0   15 files   ±0     0 :x: ±0 

Results for commit c2ee1154. ± Comparison against base commit 364b723d.

:recycle: This comment has been updated with latest results.