This is the minimum framework to support connecting to a libeis server, adding
a device and sending relative pointer motion events.It's missing a bunch of
checks and verifications, many of the hooks are still missing, etc.
See the tools/ directory for an example. The protocol is as outlined in
commit f7a24b2fbd.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
