* Add virtual property owner to OpenSpaceEngine
* Ability to add and remove virtual properties
* Do not try to render empty PropertyOwner name
Compile fix for iswaComponent
Add example in default.scene
* Delete virtual properties also in the OpenSpaceEngine dtor
* Make RenderablePlanet not crash if the nighttextures are not present
* - Add VirtualPropertyManager to manage ownership of virtual properties
- Only execute regex when it was necessary
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