#279 New DAO modules
#279 New ´constants´ module for enum types shared
#279 Extracting first constants: ´Status´
#279 Extracting first constants: ´Entity´
#279 Extracting first constants: ´EventType´
#279 Extracting first constants: ´ProjectRole´
#279 Extracting first constants: ´GlobalFunction´
#279 Move of the DAO model
#279 Renamed the ´constants´ module into ´common´
#279 Renamed the ´constants´ package into ´common´
#279 Moved ´Ack´, ´ID´ and ´EntityID´ into the ´common´ module