More encapsulation work and other minor improvements.

* EDA_RECT and EDA_ITEM completely encapsulated.
* Removed unnecessary EDA_ITEM member m_Selected and replaced functionality
  with SELECTED flag bit.

common/base_struct.cpp

@@ -70,7 +70,6 @@ EDA_ITEM::EDA_ITEM( const EDA_ITEM& base )
     m_Flags      = base.m_Flags;
     SetTimeStamp( base.m_TimeStamp );
     m_Status     = base.m_Status;
-    m_Selected   = base.m_Selected;
 }
 
 
@@ -86,9 +85,7 @@ void EDA_ITEM::InitVars()
     m_Flags     = 0;        // flags for editions and other
     SetTimeStamp( 0 );      // Time stamp used for logical links
     m_Status    = 0;
-    m_Selected  = 0;        // Used by block commands, and selective editing
     m_forceVisible = false; // true to override the visibility setting of the item.
-
 }