Qt widget to select an indirect instrument configuration

[DanNixon]

This ticket is blocks : TRAC10711, TRAC10779, TRAC10960

This is used on at least three interfaces and the way it is done is slightly different on each one (where it need not be), this should really just be wrapped in a Qt widget that has combo boxed for the instrument, analyser and reflection.

There should be properties for:

• Technique
• Removing specific instruments
• Locking to a single facility
• Disabling diffraction mode
• Forcing diffraction mode

It should be laid out as per IDR: Instrument [IRIS v] Analyser [graphite v] Reflection [002 v]

This widget should then be used on IDR, Diffraction and Tools (replace this with a single bar across the top of the window as per IDR).

[DanNixon]

This issue was originally trac ticket 10863