Fixed loop bug in Measure bar callbacks
Most of the main pane is working and refactored to ui length and pattern bank.
- hook up selected machine change for slots ui
- Sequencer Slot update name for redraw
- Sequencer Slot play button is not toggle
- Sequencer Slot hook up mute/solo buttons
- Sequencer Grid redraw steps for each slot
- Sequencer Grid draw current step on all slots
- last selected Import directory restore
Added new step sequencer in Main for viewing all steps of a machine.
Add ViewPane impl in view manager impl
- hook selected measure into scroll pnae scroll y
- StepSequencerPane is collapsable where its either showing 1 measure at a time(16 steps)
or it pop outs a scrollpane to show all
Package refactor.