[task] research instanced housing

[francy51]

Research possible methods with which we could implement instanced housing with the current portal system.

[DX4D]

This is related to issue #28
As mentioned in that post:

There are already great 3rd party building solutions like EBS (Easy Build System) that do this job already. I would not consider player building/housing a core feature, so it should be an addon/module/integration.

[DX4D]

Ownable Instances could be another option - or a better option (imho) would be Zone Teleporters that require a "key" to be used - then each "key" can link to a particular instance number in that zone. This decouples the zones from depending on the PlayerComponent as the "key" can be stored as a simple integer (or char/int struct if we want categories)

Not meaning a physical key item here btw, the key is just an identifier in the code. (which could easily be attached to a key item too depending on implementation)