[c2958] Implement more combat abilities for Thorim

Please note that the script isn't yet complete, but it should be playable.

Notes:
* spell 62186 has invalid duration; we had to use a script workaround to avoid additional problems
* spell 62017 won't trigger because of map LoS. I'm not sure if this is a vmap issue or a spell issue

(based on commit SD2-WotLK [2958] - 660117e)

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