Axis inversion for virtual touchscreen

[mvollrath]

Overview: Sometimes we want to invert axes on the virtual touchscreen to work around weird devices.

Requirements:

• Can use a parameter to invert X and Y axes of the virtual touchscreen.

Development notes How to do it: xinput set-prop 'DeviceID' 'Evdev Axis Inversion' <x:0,1> <y:0,1>

A place to put it.