edje: add PROXY part.

edje: add PROXY part.

example:

collections {
   group {
      name: "main";
      parts {
         part {
            name: "sub1";
            type: GROUP;
            source: "sub1";

            description {
               rel1.relative: 0.5 0.5;
               rel2.relative: 1.0 1.0;
            }
         }

         part {
            name: "pro2";
            type: PROXY;

            description {
               rel1.relative: 0.0 0.5;
               rel2.relative: 0.5 1.0;
               source: "sub1";
               color: 255 0 0 128;

               map {
                  on: 1;
                  smooth: 1;
                  rotation {
                     z: 30;
                  }
               }
            }
         }
      }
   }

   group {
      name: "sub1";
      parts {
         part {
            name: "rect";
            type: RECT;

            description {
               rel1.relative: 0.0 0.0;
               rel2.relative: 0.5 0.5;
               color: 255 0 0 255;

               map {
                  on: 1;
                  smooth: 1;
                  rotation {
                     z: -30;
                  }
               }
            }
         }

         part {
            name: "pro1";
            type: PROXY;

            description {
               rel1.relative: 0.5 0.0;
               rel2.relative: 1.0 0.7;
               color: 128 128 0 128;
               source: rect;
            }
         }
      }
   }
}

git-svn-id: http://svn.enlightenment.org/svn/e/trunk/edje@57694 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33