Core: Fix compile (Thanks to Sovak for reporting). Remove many warnings and Fix possible out of bounds access to Void storage

src/server/game/Handlers/SkillHandler.cpp

@@ -48,7 +48,7 @@ void WorldSession::HandleLearnPreviewTalents(WorldPacket& recvPacket)
     {
         if (TalentTabEntry const* talentTabEntry = sTalentTabStore.LookupEntry(_player->GetPrimaryTalentTree(_player->GetActiveSpec())))
         {
-            if (talentTabEntry->tabpage != tabPage)
+            if (talentTabEntry->tabpage != uint32(tabPage))
             {
                 recvPacket.rfinish();
                 return;