Fix polarization analysis in GUI (#190)

Passes polarizer and analyzer states from GUI to core.

Also check for withPolarizerAnalyzer flag for GISAS.

Resolves #190 (closed)

requested review from @j.wuttke

assigned to @m.svechnikov

approved this merge request

added 2 commits

• a6668726 - change default analyzer values
• 4154fffb - upd changelog

Compare with previous version

enabled an automatic merge when the pipeline for 4154fffb succeeds

aborted the automatic merge because source branch was updated

added 2 commits

• 20739df9 - enable pol analysis on GISAS instrument itemization
• ce64676f - enable pol analysis on Offspec instrument itemization

Compare with previous version

enabled an automatic merge when the pipeline for ce64676f succeeds

merged

mentioned in commit 854ec980