- Moving the mouse's dependent events inside the MouseHandler and removing the FrameAction.
- MouseHandler is only enabled when the gizmo is selected. There is no infinite loop waiting for an event.
- Special entity acting as an object container: we can add the entities we want to control with a gizmo inside it.
- Drawing the gizmo always on top of the object to make sure to see it every time.
- Scale is computed using the distance between the gizmo's center and the mouse. The scale unit (where nothing changes) is defined by the distance between the gizmo's center and the picked position.
- Translations are computed using the dot product between the mouse vector (picked position to current position) and the projected picked axis vector. Like this, the behaviour is a lot more natural and user-friendly.
