Look into allowing live-streaming of images

[psavery]

This will be useful, for instance, for scanning through several omega angles and looking at their saturation before collecting the data. This will help in determining how much exposure to use, so that the pixels are not saturated during data collection.

We can look into using pvaPy for this.

Look at c2dataviewer for inspiration.

To test this, we might want to create a simAD locally.