Currently divided between evdev_tag_touchpad() and twp_want_dwt() and possibly in other places too. Move all the internal/external tagging to one place and leave dwt only with the specialised checks.
https://lists.freedesktop.org/archives/wayland-devel/2016-June/029755.html
related: https://github.com/systemd/systemd/pull/3638
commit 0c51a52389ae5d83a3c76eca4ccf3beb409e01a8 Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Thu Jun 30 12:05:35 2016 +1000 touchpad: unify internal/external touchpad tagging
Reopening because the systemd commit has been merged now and we need to add the libinput bits to parse the property.
https://lists.freedesktop.org/archives/wayland-devel/2016-July/029886.html
commit 64e39411892fa4897f6e018daaa2de2ffaf8b671 Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Wed Jul 6 07:59:31 2016 +1000 touchpad: use the udev ID_INPUT_TOUCHPAD_INTEGRATION property if available
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