driver andorcam2: add comment
gui: StreamPanels are now expanded by default
install: new launcher for odemis viewer (odemis gui standalone)
driver spectrometer: clean up

remove grating VA support as we now use an axis
move Cancellable thread pool to model future

to be shared and reused (by the andor shamrock driver)
driver shamrock: introduce basic support for the Andor Shamrock spectrometer

needs the Andor SDK 2.97 (only currently in beta, only works with the SR303i).

Also introduces a special subclass of AndorCam2 that is supposed to behave as a spectrometer.
Merge branch 'master' of vpn.delmic.com:odemis