Core/Scripts: improvements on the Thorim script

Improvements done to initial work by joschiwald:

- Fixed stormhammer casting and visuals
- Fixed spell credits
- Implemented removal of Impale when HP is higher than 90%
- Corrected faction templates for the pre combat creatures
- Implemeted Leap on the arena adds (thanks to joschiwald for implementing conditions)
- Scripted lighting charge using AuraScript periodic
- Fixed timings
- Corrections on the hallway encounters (added knockback immunity to minibosses too)
- Fixed multiple blizzards issue
- Lever will now reset properly, should players fail to get inside. This allows the door to be opened more than once during the combat
- Corrections in the outro event
- Implemented paralytic field traps on the hallway.
- Implemented Ancient Gate of the Keepers opening.
- Changed blizzard bunny targetting to conditions entirely.
- Removed obsolete scripts
- Standards: delete spell script names by ScriptName instead of spell_id
- Swapped factions for pre-adds (alliance should get horde trash and vs)
- Fixed Leap setting home position for adds
- Removed a bunch of magic numbers
- Runic Colossus should finish current Runic Explosion before beginning to attack
- Fixed UpdateAI logic to put it in line with other scripts (ie don't stop casts)

Special thanks to:
- chaodhib for the blizzard trigger waypoints and investigation on spell radius
- Malcrom for creating the Conditions Creator :P

Closes #15008
Closes #17072

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