[instance] Removed instance system and commented out double deletes on
test. Added pending task on planning.md to write a widget collection
system.
Added github wikipage into project as submodule
[canvas system] renamed legacy canvas system to coexist with new one.
[virtual_canvas] Added simple module to begin with
[drawing algorithms] inerted algorighms into a single module.
Major redesign undergoing
[event] renamed uid to code
[event] widget event propagation core done.
[event] event system done, drawing and deletion using the event system, as well interaction. Interaction on simu still disabled, needed upgrade there.
[event] click system prelimiary version done; interaction on simu fully enabled.
[position] Added relative position notion inside widgets, need to change the drawing system to use it.
[widget] renamed functions relating to the widget tree
[copyright] Updated copyright year.
[positon] Using relative position system, canvas module requirements improoved (read TODO in canvas.c)
[copyright] Inserted copyright on helper_types.c
[copyright] Inserted copyright file comment header
[copyright] Inserted copyright file comment header