Show XYZ coordinate values on the screen

When cursor is moving around 3D scene, there should be view to show the values for X Y and Z on the screen. The output must be

• toggleable, someone might want to disable it
• show values as cursor moves but only when cursors is within 3D scene
• either overlay on screen on top of the scene OR print values outside the drawable area (so either in top toolbar or below the main screen)