Add: mod storage database

settingtypes.txt

@@ -52,4 +52,6 @@ factions.faction_user_priv (Enable faction user priv) bool false
 # Set the way that the parcel protection works (2d, 3d).
 # 2d limits how far x and z can go but protection on the y goes up and down far.
 # 3d limits all three axis.
-factions.protection_style (Protection style) enum 2d 3d,2d
+factions.protection_style (Protection style) enum 2d 3d,2d
+# Set the type of database to use.
+factions.database (Database) enum mod_storage colddb,mod_storage