Core/Players: Implemented actionbar dropdown menus.

src/server/game/Entities/Player/Player.cpp

@@ -6662,6 +6662,7 @@ bool Player::IsActionButtonDataValid(uint8 button, uint32 action, uint8 type)
         case ACTION_BUTTON_CMACRO:
         case ACTION_BUTTON_MACRO:
         case ACTION_BUTTON_EQSET:
+        case ACTION_BUTTON_DROPDOWN:
             break;
         default:
             TC_LOG_ERROR(LOG_FILTER_PLAYER, "Unknown action type %u", type);

src/server/game/Entities/Player/Player.h

@@ -307,6 +307,7 @@ enum ActionButtonType
     ACTION_BUTTON_SPELL     = 0x00,
     ACTION_BUTTON_C         = 0x01,                         // click?
     ACTION_BUTTON_EQSET     = 0x20,
+    ACTION_BUTTON_DROPDOWN  = 0x30,
     ACTION_BUTTON_MACRO     = 0x40,
     ACTION_BUTTON_CMACRO    = ACTION_BUTTON_C | ACTION_BUTTON_MACRO,
     ACTION_BUTTON_ITEM      = 0x80