src: converted NodeType to a class

NodeType internally still uses the Type enum

src/lib_gui/qt/view/QtGraphViewStyleImpl.cpp

@@ -9,12 +9,12 @@ QtGraphViewStyleImpl::~QtGraphViewStyleImpl()
 {
 }
 
-float QtGraphViewStyleImpl::getCharWidthForNodeType(Node::NodeType type)
+float QtGraphViewStyleImpl::getCharWidthForNodeType(NodeType type)
 {
 	return QFontMetrics(QtGraphNode::getFontForNodeType(type)).width("QtGraphNode::QtGraphNode::QtGraphNode") / 37.0f;
 }
 
-float QtGraphViewStyleImpl::getCharHeightForNodeType(Node::NodeType type)
+float QtGraphViewStyleImpl::getCharHeightForNodeType(NodeType type)
 {
 	return QFontMetrics(QtGraphNode::getFontForNodeType(type)).height();
 }