Display marks for clap candidates in wave graphs
Add hooks for graph mouse-click and mouse-over events
Implement slice-preview for wave graph mouse-over events
Implement clap-change via wave graph click
Bugfix: kill A/V preview on exit
Fix warning/implement the "separate" merge option
Refactoring
Refactoring
Fix error that occurs on startup when no cache dir (e.g., ~/.postslate) exists
Fix error popup when a merge is cancelled
Change default main window size
Work around an ffmpeg bug whereby a selected audio stream did not get copied on merge