Use libinput to monitor for events on Linux

[DanielJoyce]

This will provide compatibility for Wayland and X11, as X11 uses Libinput under the hood now for its event source.

There are several linux keyboard macro systems now that use libinput for example.

[lthms]

I’d be willing to contribute to rdev to add this. Any advice about that before I dive in? My understanding is that the key file to update is listen.rs

[FoxxMD]

I've got a sample app using libinput that gets key code events and (some) mouse information, here, that may be of use. Problems I'm encountering currently:

• Key codes do not match with what rdev has defined
  • EX libinput key event a is 30 => rdev is 38
  • libinput b is 48 => rdev is 56
  • libinput c is 46 => rdev is 54
• Pointer motion events (for a mouse) are limited to relative XY changes
  • Getting initial absolute position seems to be non-trivial since wayland doesn't allow querying the mouse outside of the windows owned by the application

[Zhou-Tx]

我已收到你发的邮件，谢谢