Prebuilds get desynced when there is at least 2 clients with host.

[hubastard]

During our playthrough:

1. The create the game
2. Client 1 connects
3. Client 2 connects
4. Both client 1 and 2 add a couple of buildings
5. Host starts to receive prebuild id that is not tracked in the prebuildRequest dictionnary.

You will see a warning like this on the host that will repeat overtime since the client will try to BuildFinally the prebuild forever:
BuildEntityRequest received does not have a corresponding PrebuildRequest with the id 20 for the planet 104

[hubastard]

Fixed in the following commit: aeb063e