Include git hash in the version information dialog

[fedorov]

This is quite important to be able to determine what version of code is deployed while testing. Maybe also include whatever is easy to include for dicom-microscopy-viewer?

Right now we only have the release number.

[igoroctaviano]

Will be delivered by: #355

[fedorov]

This is still not working in IDC deploy, some env variable will need to be set....