GFX: bg editor support undo.
GFX: fix overloading file loading.
GFX: fix floating bar drag when bottom bar is folded.
GFX: fix copying brush outside on grid view.
GFX: fix pasting now clip instead of wraping on grid view.
GFX: fix wrong palette shown when switch from/to grid view.
GFX: bg tool that touch outside of the bg will pan.
GFX: can draw bg with rectangle.
GFX: fix bg scroll bug after creating new bg.
Fix crash with 'SKIP'.
iOS: fix a couple of dropped frames the first time a program plays a sound.

Redo the desktop Development Menu.
Support window resize.
Scroll it by dragging with the mouse or with the wheel.
Editor programs are a plain list, up to 16 of them instead of 4.