Maintain option for camo nets, tank traps and sandbags.

[LO0TC1F3R]

As for now, camo nets, tank traps and sandbags get cleaned up by a script. making them permanent does not seem smart, but they do add a lot to the base building which came back with 1.8.8. So I wonder if there could be a system added to just keep those objects ingame by maintaining them and thus saving them from being deleted.

[Landbergaren]

This would make more sense then current model. The map gets cleaned up from the trash objects and the ones that players actually still use and wants, stays on the map. Also some players are beeing kept even more busy.