Scripts/Trial of the Crusader:

1) Fix Leeching Swarm damage and create spell difficulty links to code. Closes  issue #4909 .
2) Fix Valkyr's Touch. Closes  issue #4553 .
3) Fix Permafrost aura difficulty check.
4) Reduce Slime Pool damage range.
5) Avoid Shaman Champion Heroism spam using 5 minutes (CD) as timer.
6) Fix many spell target selection to only select players (no more totens or pets).
7) Fix Anub'arak Spike being able to receibe the permafrost aura in order to cast spike fail, hopefully.

src/server/game/Entities/Unit/Unit.h

@@ -1255,6 +1255,7 @@ class Unit : public WorldObject
         inline bool HealthAbovePct(int32 pct) const { return GetHealth() * (uint64)100 > GetMaxHealth() * (uint64)pct; }
         inline float GetHealthPct() const { return GetMaxHealth() ? 100.f * GetHealth() / GetMaxHealth() : 0.0f; }
         inline uint32 CountPctFromMaxHealth(int32 pct) const { return CalculatePctN(GetMaxHealth(), pct); }
+        inline uint32 CountPctFromCurHealth(int32 pct) const { return CalculatePctN(GetHealth(), pct); }
 
         void SetHealth(uint32 val);
         void SetMaxHealth(uint32 val);