Add empty Graphiti project

New start point to create a brand new editor for Xdf networks
Customize the rendering for an Instance

Sizes are defined with constants
An instance can be deleted, but not removed
An instance can't be resized
Styles are set for all elements of the graphics algorithm
Implements direct editing

It is now possible to edit Instance name directly after
adding it to the diagram.
Implements refinment of Instances

Ports are displayed in the Instance graphical element, but sizes are not handled correctly
Set a common *Pattern superclass for managing IDs
Fix resizing and layouting for instances shapes
Refactoring on StyleUtil
Add a simple implementation for Network ports
Add empty ConnectionPattern, clean related useless features
Allow direct editing on Ports
Enable direct editing on ports
Refactoring
Enable direct editing when adding port
Selection around a port does not include text
(Ports) Fix layout and resize feature
Add docs
Simplify the helper method to get a child from its ID
Simplify update() method
Better managment for direct editing
Refactoring