[0440] Fixed gossip menus for Elders in Lunar Festival

* Fixed missing gossip menu options for some of the Elders in Lunar
Festival game event
Data taken from YTDB. This closes #277
[0441] Improved start date of Lunar Festival

* Improved start date of Lunar Festival event. Start date in 2006 was
01/27/2006 and not 02/12/2006.
Note to server administrators:
the start date of the event will have to be adjusted _manually_ every
year to match the actual Lunar New Year, like Blizzard does for the
retail event. Until 2010, the start date would be 2 days before the
actual New Year.
Source: http://www.wowwiki.com/Lunar_Festival
This closes #278
[0442] Added missing NPCs and GOs for Lunar Festival

* Added missing NPC in Darnassus for Lunar Festival holiday event
Source: YTDB & UDB
* Added missing GO in Darnassus for Lunar Festival holiday event
Source: UDB
[0443] Fixed level of Lunar Festival quests

* Fixed quest level of Lunar Festival quests because they should be
available to any player while they are currently flagged as lvl 70 or
with minlevel = 68, making them 100% unavailable in Classic
Source: http://www.wowwiki.com/Lunar_Festival
This closes #276 and closes #279
*  Fixed gossip of creature 15895 (Lunar Festival Harbinger) to make it
offer Lunar Festival Invitation
* Added script to create Lunar Festival Invitation
*  Fixed spells, NPCs and gameobjects for quest "Lunar Fireworks" :
Fixed some of the spell focus objects not working
[0444] Fixed holiday teleports for Lunar Festival

* Fixed holiday teleports of Lunar Festival not working. This closes
#291
* Fixed class and spell charge of item 21711 (Lunar Invitation) which
was previously a consumable while it is in fact an holiday item that
should not disappear when used
- Fixed Lunar Invitation teleport not working (to Moonglade and back to
majors cities)
- Added missing spell focuses GO for spell 26373 (Lunar Invitation)
- Added target position to each teleport spell in Lunar Festival
- Added script to cast teleport spell on players
- Added script target for Lunar Invitation spell to trigger teleport
script