Miscellaneous

Some miscellaneous stuff that's been sitting in the backlog:

- Added 'data not being saved' warning before first epoch group.
- Fixed issue where new epoch group would forget output path.
- Now closing protocol figures after editing parameters (figures may change based on parameter changes).
- Removed sample stimuli warning while editing parameters (this was overkill).
- Disabled edit parameters button on pause.
- Added oscilloscope triggering to example seal/leak protocol to demonstrate digital stimuli.