Coverity check CID 71398, 71403, 71416, 71450, 71471: Use pass-by-reference...

Coverity check CID 71398, 71403, 71416, 71450, 71471: Use pass-by-reference instead of pass-by-value to speed codegeneration up and use less resources.

The flaw/correction is everywhere the same:
... getCodeViewerDialog(... , Settings::CodeViewerState & state)

REVIEW:124358
CCBUG:340646