[10203] Rename `item_template`.Faction to Flags2 and define some values for it.
 

<pre>m sql/mangos.sql
+ sql/updates/10203_01_mangos_item_template.sql
m sql/updates/Makefile.am
m src/game/ItemHandler.cpp
m src/game/ItemPrototype.h
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[10203] Rename `item_template`.Faction to Flags2 and define some values for it.

Thanks to Shauren for research flag ITEM_FLAGS2_COST_REQUIRES_GOLD meaning
and inspiring in general what must be done long time ago with field rename
and other enum values listing.</pre>



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