Extend camera support

[kmsquire]

• detection of camera devices
• testing on OSX, Windows
• control of camera devices (contrast, etc.)
• fliplr during display

[IanButterworth]

While I haven't found any evidence of hope on Windows or MacOS for camera control, it can be achieved on Linux through v4l-utils (which has a lot of deps, so would likely be a lot of work to provide through BinaryBuilder):

Adjusting camera functions
Brightness, zoom, focus, etc, can be adjusted with v4l2-ctl. Display all controls and their menus:

v4l2-ctl -L
Then adjust the value:

v4l2-ctl -c <option>=<value>

https://trac.ffmpeg.org/wiki/Capture/Webcam

[IanButterworth]

I think control of camera settings may have proven to be a bigger task for which the right solution remains unclear.

Worth noting that there are scientific camera control packages out there for different vendors, like Spinnaker.jl

I think I'll close this as camera support appears stable in recent releases.