Updated ScrollWidget design
Removed debug, pass initializer list as & and made a method to add widgets to panels
Added two basic panel, will be used for scripting purpose

Can now put an infinit number of panels inside panels
ScrollWidget recursively calculs and moves widgets inside panels
Can now inject / script trigger function to panels and widgets

Made an exemple out of SelectList
auto align keyWidget on widget's contruction method
normalized some functions (their names) and removed a duplicate
Updated Awidget's doc
Merge branch 'menu' into develop
Merge branch 'develop' of github.com:izissise/PFA into develop