This allows a blockarea to have an Offset.
Using ```const Vector3i &```
Renamed m_Offset to m_WEOffset
Documented the functions.
Fixed APIDump
Merge branch 'master' into cBlockArea_Offset
Renamed cBlockArea Offset to WEOffset.

Even in getters / setters.
APIDump: Updated WEOffset-related docs.
Merge pull request #786 from mc-server/cBlockArea_Offset

Added WE Offset to cBlockArea