closes #18 !!! WARNING !!! The server requires a new database, compact.3030.custom.sqlite3;

[NL0bP]

[Items cannot be bought from NPC merchants. The sale is one item at a time only.

• fixed buying and selling things, but requires replacement of the compact.sqlite3 database;

[Game] made changes to UnitAttribute for Npc:

• added parameters "heir_level";