Improvements for use with a big touchscreen monitor

[Ribakys]

With a big size touchscreen monitor, some news improvements can appears :

• [ ] A long time touch to activate the temporary zooming in location of our finger (in replacement of "space" key because we don't use a keyboard). -> Now the long press allow to select a locked element
• [ ] A rounded button at the bottom that allows you to lock or unlock the background movement (this isn't the items movement)
• [ ] A rounded button at the bottom that allows you to lock or unlock the general zooming.
• [ ] Optionally : Ability to draw on the background and also ability to draw on the foreground.