Feature: Spawn game objects.

[Victov]

Spawn a game object into the world, visible for all players that are near it.

• Does not have to do anything (no right click response or fancy scripted stuff)
• Must be database driven, not hardcoded, gameobject template and gameobject spawn

This feature is part of the Full world Traversal milestone, since we need portals to work to be able to fully traverse the world.