Fixed #165, Fine tune fixes!

* Fixed an issue with the cooldown timing.
* Fixed issue with 'right click' using items under players.
* Some changes to the minimap control (ctrl + mouse wheel to
  change floors and tweaked the zoom/move speeds).
* Fixed some bugs in the trade module.
* Added new Spells table for spell related functions
  (Also added getSpellByName and getSpellByWords).
* Fixed an issue with follow/attack cancelling (wasn't calling
  onFollowChanged for updates in battle, etc).

src/otclient/game.cpp

@@ -862,7 +862,14 @@ void Game::cancelAttackAndFollow()
     if(!canPerformGameAction())
         return;
 
+    if(isFollowing())
+        setFollowingCreature(nullptr);
+    if(isAttacking())
+        setAttackingCreature(nullptr);
+
     m_protocolGame->sendCancelAttackAndFollow();
+
+    g_lua.callGlobalField("g_game", "onCancelAttackAndFollow");
 }
 
 void Game::talk(const std::string& message)