try to detect camera SDK crashes

[agalasso]

it would help ease our support burden if PHD2 could detect camera SDK crashes (like access violation errors) and notify the user to contact the camera vendor for support. PHD2 would still need to terminate if such an exception occurs, but if possible we could at least provide some indication to the user about the origin of the problem.
We would need to display the SDK crash message for:

• exceptions in any non-PHD2 threads, that is, threads launched by the camera SDK code
• any exceptions in PHD2 threads that occur during an SDK API call