[0021] Updated gossip_* tables from TBC-DB

WARNING: backup your data before applying this update.

* Backported gossip_menu, gossip_menu_option, gossip_scripts tables from
TBC-DB to classic DB (method used : merge, with TBC-DB as the more
up-to-date DB). Thanks XSavior for providing TBC-DB.
* Removed TBC-only entries in gossip_menu table (entries 7105 -> 7378 ;
7380 -> 10264 ; 11431 -> 19999, and a dozen of various single rows)
* Removed TBC-only entries in gossip_menu_option table (menu_id 7105 ->
7378 ; 7380 -> 10264 ; 11431 -> 19999, and a dozen of various single
rows)
* Removed TBC-only entries in gossip_scripts table (a dozen of various
single rows)
* Rows not clearly related to TBC/WotLK were untouched

Note: this update adds a great number of gossip menus that have not a
related gossip_menu_id in creature_template and gameobject_template
tables. Thus, most of the gossip menus added by this update won't be
seen in game... yet. This will be fixed in a next commit when more data
from TBC-DB are backported.