Rewrite/extend map scripting logic to support multiplay houses

Registered by Renegade

As much as I'd love to see this done, there's a shitload of code involved that needs to be changed for this to work right. So setting a distant future target.

##### ADDITIONAL INFORMATION #####
If anyone wants to know just how much code we're talking about, I saved some minimized flowcharts of the two main functions:
http://dc0d3r.name/ares/TEventClass_HasOccurred.png

Blueprint information

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Not started
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Undefined
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Direction:
Needs approval
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Definition:
Drafting
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Implementation:
Unknown
Milestone target:
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(?)

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