Renamed: Node::onMouseEnter and Node::onMouseExit in favor of: Node::onMouseOver and Node::onMouseLeave.
Renamed events NodeMessage::MouseEnter and NodeMessage::MouseExit for: NodeMessage::MouseOver and NodeMessage::MouseLeave.
Renamed events Event::MouseEnter and Event::MouseExit for: Event::MouseOver and Event::MouseLeave.
Node::onMouseOver and Node::onMouseLeave now reports the message to its parent tree.
Node flags now all passed as `const Uint32&`.
--HG--
branch : dev