refactoring qad widgets part 2

c++ cast, nullptr, forward declaration, agregate ui, connect to member functions, order and clear includes

libs/widgets/mathvectoredit.cpp

@@ -1,5 +1,6 @@
 #include "mathvectoredit.h"
 #include "qvariantedit_custom.h"
+#include "qad_types.h"
 #include "matrixedit.h"
 #include <QBoxLayout>
 
@@ -43,11 +44,10 @@ void MathVectorEdit::setReadOnly(bool yes) {
 class MathVectorEditFactory: public QVariantEditorFactoryBase {
 public:
 	MathVectorEditFactory() {}
-	virtual QWidget * createEditor() {return new MathVectorEdit();}
+	virtual QWidget * createEditor() override {return new MathVectorEdit();}
 };
 
 
 __MathVectorEditRegistrator__::__MathVectorEditRegistrator__() {
 	QVariantEditorFactories::registerEditorFactory(qMetaTypeId<QAD::MathVector>(), new MathVectorEditFactory());
-	//__QADTypesRegistrator__::instance()->toString_funcs.insert(qMetaTypeId<QAD::IODevice>(), &QAD_IODevice_toString);
 }