Open a file at launch

We want to be able to open a given image at the launch of Braggy, given its path (from MXCube).

A possible implementation would be to allow a file (temp name) query parameter in the Braggy URL that Braggy would parse at launch and open the appropriate path.

The path should be:

• encoded
• composed only of a POSIX path for .cbf images (?file=<POSIX_path>)
• composed of a POSIX path and a HDF path for .h5 images (?file=<POSIX_path>:<HDF_path>)

It would be then up to the calling app (MXCube) to generate this URL.