Removed debug-code
EditPane removes AdditionalCamera TaskPane if it was selected and closed
Removes connection lines when not selectedObject
Point - and SpotLights by default have visible symbols, the DirectionalLightSymbol is only visible when the Light is selected
DirectionalLightSymbol jumps in front of camera when light selected
DirectionalLightSymbol can't be dragged cuz makes no sense
Fix: DirectionalLight sometimes popped up at the wrong place when selected