Add calibration_matrix config option
Can be used to change the orientation of a touchscreen.
Example usage with swaymsg:
# identity
swaymsg input type:touch calibration_matrix '"1 0 0 0 1 0"'
# 90 degree clockwise
swaymsg input type:touch calibration_matrix '"0 -1 1 1 0 0"'
# 180 degree clockwise
swaymsg input type:touch calibration_matrix '"-1 0 1 0 -1 1"'
# 270 degree clockwise
swaymsg input type:touch calibration_matrix '"0 1 0 -1 0 1"'
Documentation:
https://wayland.freedesktop.org/libinput/doc/latest/absolute-axes.html#calibration-of-absolute-devices
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