Depthai-viewer

- Performance fix.

- Added support for OAK-T
- Support multi viewer windows at the same time: `depthai-viewer --port <your-port>`

- Added ability to control IR dot projector and flood light brightness.

- UI improvements
- Added support for OAK-D-SR POE (tof)
- Fixed some bugs:
- https://discuss.luxonis.com/d/2425-depthai-viewer-not-working-with-ffc-4p-based-setup/3
- Blob download failure in dependency installer

- Added depdendency installer.
- Added auto device selection on startup:
- On startup: If a preferred device is set, try to connect to that device. Else (if preferred device not found or not set) connect to the first available device.
- Whenever a device is selected it is designated as the preferred device. A preferred device is persisted between runs of depthai-viewer.

- Added dependency installer.
- Added auto device selection (+preferred device) on initial startup.