Scripts/Commands: Implement commands to set and get boss states during r...

...un time

I might need help making this look better...

It was originally written for MaNGOS a long while ago by @tibbi and others, then initially converted to tc by @heihachi, I've done some work on top of it but still not entirely sure if it's good enough.

They may seem a bit of silly, but they're extremely helpful to save heaps of time when testing instances and encounters with previous requirements (i.e ToC)

Sooo discuss.
There's a max of 5 expected encounter states, this check might be trivial but I don't know if setting it to a wild value might give us unexpected results