Core: Clean up script variables to make variables consistant/standardized, and some additional warning-removals:

+ Fix compilewarning in Unit.cpp
+ Remove/comment out unused parameters for some commandscripts/scripts (warnings)
+ Replace "plr" with "player" all over the scriptbase for consistency

src/server/scripts/Northrend/Nexus/Nexus/boss_anomalus.cpp

@@ -117,7 +117,7 @@ class boss_anomalus : public CreatureScript
                 return 0;
             }
 
-            void SummonedCreatureDies(Creature* summoned, Unit* who)
+            void SummonedCreatureDies(Creature* summoned, Unit* /*who*/)
             {
                 if (summoned->GetEntry() == MOB_CHAOTIC_RIFT)
                     chaosTheory = false;