* Add oneTouch option when creating tool. These tools won't be selected, rather their onstart action will be executed once.

Useful for undo/redo/clear/upload/zoom-in/zoom-out

* added grid

* move pattern to dedicated file

* Reformat code in grid tool

* Restore the gradient over the active tool

* Remove some duplicated code in oneTouch handling

Co-authored-by: Robert Beach <rdbeach@gmail.com>
Co-authored-by: Ophir LOJKINE <pere.jobs@gmail.com>