QUEST: Carmelo Story line quests

Refactor The Siren's Tear quest
(http://wiki.ffxiclopedia.org/wiki/The_Siren%27s_Tear):

* Add local variables to all npcs
* You need to talk to Carmelo to obtain de siren's tear again

Add The Stars of Ifrit quest
(http://wiki.ffxiclopedia.org/wiki/The_Stars_of_Ifrit):

* TODO: I don't know if you don't meet all conditions, the point ???
display a text or are hidden (i don't play on retail)

Add Love and Ice quest (http://wiki.ffxiclopedia.org/wiki/Love_and_Ice):

* TODO: I don't know if you don't meet all conditions, the Mirror Pond
display a text (i don't play on retail)

Add A Test of True Love quest
(http://wiki.ffxiclopedia.org/wiki/A_Test_of_True_Love):

Add Lovers in the Dusk quest
(http://wiki.ffxiclopedia.org/wiki/Lovers_in_the_Dusk):

* TODO: I don't know if you don't meet all conditions, the ??? point
display a text (i don't play on retail)