Start expunging NULL.

Given that KiCad is a C++ project, we should really be using nullptr
instead of NULL.

common/plugins/eagle/eagle_parser.cpp

@@ -195,7 +195,7 @@ EROT Convert<EROT>( const wxString& aRot )
                             + 1                        // skip leading 'R'
                             + int( value.spin )       // skip optional leading 'S'
                             + int( value.mirror ),    // skip optional leading 'M'
-                            NULL );
+                            nullptr );
 
     return value;
 }