(graphiti) Simplify DoubleClickFeature execution
(graphiti) Ensure update is always called correctly

When an instance or a port is renamed, manually calling update feature
ensure the update is triggered in the same Command instance. This fix
issues with undo / redo after naming an object on the diagram
(c backend) Fix issues with initializes functions

 - If an actor contains many initializes, they are all called
 - If an initialize write to output FIFO, indexes are correctlu updated