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.
please initialize player to nullptr (or it could be left uninitialized if normalizePlayerName(playerName) at line 219 returns false