libinput provides sub-pixel precision for pointer motion & touch events.
Keep this precision by switching all coordinates values from input
events to f64 (rather than i32 or u32). Otherwise, values are rounded
and part of the movment is lost.
Potentially fixes#224
slog-stdlog has a significant dependency tree and is basically unsued if
the downstream crate of Smithay always provides a logger (like anvil),
so it is not really needed.
Change the session backend to rely on Signaler to propagate its
signals. Also introduce the Linkable trait to allow generic composition
of objects needing to listen for signals.
Use helper functions in <LibinputInputBackend as InputBackend>::dipatch_new_events
to simplify the code
Move said helper functions to libinput/helpers.rs
Move libinput.rs to libinput/mod.rs
Victor Berger
Poly
Sergey Smirnykh