Waveform: Zoom functionality

[matthewh806]

The generalised waveform component would benefit greatly from the ability to zoom in.

• [x] Waveform: zoom in / out with two finger y axis motion
• [x] Waveform: translation L / R with two finger x axis motion
• [x] Waveform: reset position with command + click
• [x] Waveform: Argument / methods to set zoomable on / off
• [x] Breakbeat Maker: Pass through scroll methods to Waveform class
• [x] BreakbeatMaker: Fix marker paint method
• [x] BreakbeatMaker: Fix highlighted slice paint method
• [x] BreakbeatMaker: Fix playhead paint position
• [x] BreakbeatMaker: Marker Add, Delete, Drag should work with and be consistent with zoom levels
• [x] Granular: Set Waveform member zoom state to false