Implemented connection hiding for the NodeGraph. This is accessed by right clicking on a node in the Node Graph and using the new “Show Input Connections” and “Show Output Connections” menu items (#429).
Fixed const correctness of GraphGadget::getNodePosition().
Fixed connection drag bug. Dragging the endpoint of a connection around and then placing it back where it started was breaking the connection, whereas it should have been having no effect.
Replaced Enabled/Disable node menu item with Enabled checkbox.
Added titles to the node graph context menus.