Input rotation on touchscreen

Improvements on how input devices are rotated when using X.
Instead of looking at the name of the device, we look for property:

• Axis Labels (evdev)
• libinput Calibration Matrix (libinput)

Hotfix: input rotation

Changelog:

• Correcting rotation transformation matrices
• Adding some debugging messages
• Remove some old code plus lintage

Input rotation on touchscreen

In this release:

• Properly generates gadget and handle their lifecycle
• Addressed several segfaults
• Handle input rotation through X input devices
• Laid the ground for the configuration panel and basic saving and loading of gadget configuration

TODO:

• Handle multiple monitors
• Handle input rotation through Wayland
• Enable/disable keyboard on rotation

E gadget to auro-rotate the main screen based on sensor data

An E gadget that:

• look for sensor data coming from iio-sensor-proxy through D-Bus
• rotate the main screen (if capable of rotation) accorsing the iio-sensor-proxy data
• expose a gadget to control the auto-rotation feature. Rotation can be locked and unlocked.

TODO:

• handle multiple monitors
• use e_zone instead of randr2
• handle input (both through wayland and x)