Minor code cleanup, step2: remove more useless include.

fix also a minor compil warning

common/common.cpp

@@ -23,7 +23,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-#include <fctsys.h>
 #include <eda_base_frame.h>
 #include <project.h>
 #include <common.h>
@@ -39,8 +38,6 @@
 #include <boost/uuid/uuid_io.hpp>
 #include <boost/functional/hash.hpp>
 
-using KIGFX::COLOR4D;
-
 
 // Create only once, as seeding is *very* expensive
 static boost::uuids::random_generator randomGenerator;