Core/Shared: Move container functions to shared project under Trinity::Container namespace. Also implement RandomResizeList which takes a predicate function as parameter.

Core/ScriptedAI: Extend SummonList::DoAction to take a predicate function as parameter and allow specifying a maximum number of units to be selected.

src/server/scripts/Outland/BlackTemple/boss_supremus.cpp

@@ -134,7 +134,8 @@ public:
             if (!phase || phase == PHASE_CHASE)
             {
                 phase = PHASE_STRIKE;
-                summons.DoAction(EVENT_VOLCANO, 0);
+                DummyEntryCheckPredicate pred;
+                summons.DoAction(EVENT_VOLCANO, pred);
                 events.ScheduleEvent(EVENT_HATEFUL_STRIKE, 5000, GCD_CAST, PHASE_STRIKE);
                 me->SetSpeed(MOVE_RUN, 1.2f);
                 me->ApplySpellImmune(0, IMMUNITY_STATE, SPELL_AURA_MOD_TAUNT, false);

src/server/scripts/Outland/netherstorm.cpp

@@ -812,7 +812,7 @@ public:
                 }
                 if (!UnitsWithMana.empty())
                 {
-                    DoCast(SelectRandomContainerElement(UnitsWithMana), SPELL_MANA_BURN);
+                    DoCast(Trinity::Containers::SelectRandomContainerElement(UnitsWithMana), SPELL_MANA_BURN);
                     ManaBurnTimer = 8000 + (rand() % 10 * 1000); // 8-18 sec cd
                 }
                 else