new program action PARAM_SET, complements PARAM_COPY.

new program action PARAM_SET, complements PARAM_COPY.

Sometimes you want to catch an action like "clicked" from elm/button
or "mouse,clicked,1" from a regular part and want to set a property
like "play" on some object. In this case there is no source property
to copy, so setting the destination makes sense. This was possible
with Embryo, and now it is with regular "program".

Sample EDC:
{{{

   // test.edc, compile with edje_cc and run with edje_player

   externals {
      external: "elm";
   }
   collections {
      group { name: "main";
         parts {
            part { name: "bg"; type: RECT;
               description { state: "default" 0.0;
                  color: 255 255 255 255;
               }
            }
            part { name: "button"; type: EXTERNAL;
               source: "elm/button";
               description { state: "default" 0.0;
                  rel2.relative: 1.0 0.5;
               }
            }
            part { name: "display"; type: TEXT;
               description { state: "default" 0.0;
                  color: 0 128 0 255;
                  rel1.relative: 0.0 0.5;
                  rel2.relative: 0.5 1.0;
                  text { font: "Sans"; size: 16; }
               }
            }
            part { name: "entry"; type: EXTERNAL;
               source: "elm/scrolled_entry";
               description { state: "default" 0.0;
                  rel1.relative: 0.5 0.5;
                  params.bool: "editable" 0;
               }
            }
            programs {
               program {
                  signal: "clicked";
                  source: "button";
                  action: PARAM_SET "display" "text" "hello world!";
               }
               program {
                  signal: "clicked";
                  source: "button";
                  action: PARAM_SET "entry" "text" "bla!";
               }
            }
         }
      }
   }

}}}

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/edje@47635 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33