Some improvements for the Onboard on-screen keyboard full keyboard layout.

• Removed some unneeded keys: close buttons, "abc" layer ("123" already toggles it), mouse drag/hover, mouse actions toggle.
• Removed Ins/Scrl/Pause and moved right/middle click to keep the spacing between F-key groups.

Installation

Copy the files to the layouts dir (~/.local/share/onboard/layouts/ or "Open layout folder" in settings) and choose this layout in settings.