acq stream: Add 1D spectrum projection to StaticSpectrumStream

Introduce .selected_line VA and .get_line_spectrum().
Roughly tested. Need to actually be used by the GUI now.

Also introduce .width, but unused.
Merge branch 'master' of vpn.delmic.com:odemis
Autocontrast async call to Phenom API
Merge branch 'master' of delmic-server.local:odemis