Allow selecting which camera view share intrinsics

[russelldj]

As I understand it, there is currently an all-or-nothing option to couple the intrinsics of your cameras. There was interest in having a menu to select which subset of cameras should have identical intrinsics.

[borovik135]

I would also add a way of importing/configuring camera intrinsics for a particular camera or a set of cameras; and have an option of them being fixed during the calibration process, as there are use cases, when we know intrinsics upfront and would need just estimate the camera position, effectively reducing the problem to PnP.