#870 Show Notes editor in distractionless fullscreen mode

[Joerg Plewe]

Provide a distractionless fullscreen mode for the notes editor.
Just a blank screen, no menus, no toolbars, maybe in a different color scheme as it can be found in 'creative writing' software like WriteMonkey (http://writemonkey.com/) or others.

This would extend FreeMind into an excellent tool for writers.