Scripts/Silverpine: Fixed Nowhere to Run (questId 27195)

[Nyr97]

Changes proposed:

• Scripted RP event for Nowhere to Run (questId 27195).
• Added missing spawns in Deep Elem Mine.
• Added visibility conditions for spawns.

Issues addressed:

None.

Tests performed:

It builds and it was tested in-game.

Known issues and TODO list:

• Formation and MoveFollow are deadly wrong because we require a FormationMovementGenerator and FollowMovementGenerator rework (or cherrypick 434's branch one). That's the reason why the troopers' movement is so clunky. In any case, I'm keeping a register of things that I might improve and keep updated once certain new implementations get added.
• Toss Bomb (spellId 84467) isn't able to find an appropriate target even if the condition is correctly set or a wider RangeIndex is added to the spell. In any case, there's no npcTrigger or gameobject to be found to be used as entry for TARGET_DEST_NEARBY_ENTRY. The bomb is spawned after SPELL_GO is sent, so it cannot be the entry. I changed TargetA to TARGET_DEST_DB instead.
• Toss Bomb (spellId 84468) uses SPELL_EFFECT_SEND_EVENT which is unusable in TC. I changed it to serve a better purpose as SPELL_EFFECT_SUMMON.