[c2970] Implement Mimiron combat phases

This will support
* encounter start from normal and hard mode
* phase transitions
* complete dialogue and animations
* encounter ending

Please feel free to report any issues

Thanks to X-Savior and crackm for providing the necessary data

(based on commit SD2-WotLK [2970] - 99ffaa5)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>