Isolated all Frame AreaDefinition and it's layout flags to
SwFrameAreaDefinition class which is now base for SwFrame.
Adapted calls to get/set and WriteAccess hekper classes accordingly.
This allows much deeper understanding what Writer is doing when
layouting it's frames and needed when reaction on such changes
is necessary

Change-Id: I96220a1d140e69c76cc63023aae26e4ed17f3504