cleanup sample viewer code; m redundant 'Create sample' button (#778)

added 6 commits

098bddfe - InstrumentsView sort blocks; rm some formatting
9c30d428 - rm setContentsMargins calls everywhere
d3492a7c - InstrListing rm unused parent, flag
aa538008 - clang-format
207762f3 - InstrListing inherits QListView, rm spurious margin from displayed frame
116aaa61 - SampleView w/o QMainWindow and docks

added 1 commit

enabled an automatic merge when the pipeline for 87ac13ea succeeds

merged

mentioned in commit c712dfdd

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