Not store dependent spells in character_spell

* Mark spells learned in result character creating, another spell learning, skill grow,
  quest reward as dependent and not store its in `character_spell`.
* Prevent re-learning known spell in expected state
* Prevent re-learning low rank spell as active if higher rank known.
* New type of non-stacked ranked spells check: skill dependent spell bonuses.
* Activate (show propetly and cast if need) lesser spell rank
  for non-stackable in spellbooks spells at unlearn high rank

src/game/NPCHandler.cpp

@@ -254,7 +254,7 @@ void WorldSession::HandleTrainerBuySpellOpcode( WorldPacket & recv_data )
         data << uint64(_player->GetGUID()) << uint32(0x016A);
         SendPacket(&data);
 
-        _player->learnSpell(spellId);
+        _player->learnSpell(spellId,false);
     }
 
     WorldPacket data(SMSG_TRAINER_BUY_SUCCEEDED, 12);