Better touchpad support

by Alexander Mezin for KDE

Currently KDE doesn't have any built-in tools to configure touchpad. It's strange when even lightweight desktops like XFCE can at least configure touchpad without any third-party applications. I want to implement: 1) System Settings module for touchpad configuration 2) Plasmoid that will allow enabling/disabling touchpad 3) Daemon that automatically disables touchpad when external mouse is plugged in