Avx

Bugfix release: HyperDeck was not properly connecting on `initialise`.

Minor updates and enhancements:

- VISCA control in send-only mode now sleeps a short while between commands
- VISCA for PTC-150 now correctly uses speed limits for that camera model
- HyperDeck control enhancements:
- Set and report active SD card slot
- Retrieve clips list
- Change transport mode
- Correctly handle receive timeouts
- Blackmagic ATEM enhancements:
- Set multiviewer layout and window sources
- Reset audio meter peaks
- Log spam reduced
- General
- Clients now automatically re-proxy devices after a controller restart

Belated final release of 1.1.0. Just a couple of changes from `rc2`:

- Handle deinitialising BMD devices before initial connection succeeds
- Test reliability improvements

Second release candidate for v1.1.0.

Changes from rc1:

- Changes to threading model for ATEM communication to help on lower-powered machines
- Getter and broadcast for when ATEM mix transition properties change
- Update HyperDeck transport state when we initiate a change
- Add option to not wait for VISCA command acknowledgements (allows VISCA devices to work with uni-directional communication)
- Avoid a crash when deinitialising serial devices

This is a release candidate for v1.1.0 of avx.

Notable changes include:
- Start of support for Blackmagic Design ATEM switchers
- Support for Blackmagic Design HyperDeck recorders
- Support for multiple VISCA cameras on one serial port
- Support for Datavideo PTC-150 VISCA camera
- Reduced broadcast logging level to `debug`.

If no issues are found, expect a release within the next couple of weeks! Support for the ATEM and HyperDeck will continue to be expanded in future releases.