Adding draw update method into sequencer loop
Fixed step 0
Testing out highlight styles
Sync redrawing patterns with 0 step

Patterns were redrawing slightly before
Remove playing class when stopping playback
Add playing class for bass notes as well as drums
Merge branch 'develop' into Highlight-playing-cells
Adding feebdback email link
Add playing class to all cells
Styling tweaks for cell highlighting
Fixed timing of sequencer switch redraw
Only remove bass note highlighting when the note has finished playing
Fix note highlighting at last bass step
Adding animation properties for cell and note highlighting
Fix timing of switching patterns in sequence mode
Merge branch 'Highlight-playing-cells' into develop
Resolves #6