[8929] Implement gossip scripts to be used with gossip_menu_option.action_script_id

[newsbot]

<pre>m sql/mangos.sql
+ sql/updates/8929_01_mangos_gossip_scripts.sql
m sql/updates/Makefile.am
m src/game/GossipDef.h
m src/game/ObjectMgr.cpp
m src/game/ObjectMgr.h
m src/game/Player.cpp
m src/game/World.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[8929] Implement gossip scripts to be used with gossip_menu_option.action_script_id

Note that script is implemented for GOSSIP_OPTION_GOSSIP only (as not expected needed for other gossip options).
Also add a few more startup checks for LoadGossipMenuItems with check for basic errors in fields</pre>



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