refactor: Address (Windows) compile warnings (#840)

* Windows compile errors and (Qt 5.15 deprecation) warnings

* Usability - Enable/Disable Instance button

Co-authored-by: brindosch <edeltraud70@gmx.de>

libsrc/hyperion/MultiColorAdjustment.cpp

@@ -14,6 +14,7 @@ MultiColorAdjustment::~MultiColorAdjustment()
 	for (ColorAdjustment * adjustment : _adjustment)
 	{
 		delete adjustment;
+		// BUG: Calling pop_back while iterating is invalid
 		_adjustment.pop_back();
 	}
 }