Mir Gets Automatic Probing For Input Platforms

Ubuntu developers working on the Mir display server have been continuing to land more improvements to this X11/Wayland alternative although there hasn't been too much to report as of late for significant feature additions.

Landing today was automatic searching and probing of input platforms. With this large change, specifying the input platform is no longer necessary and will allow libinput to be used.

This addition for automatic input platform probing also fixes this bug where "mouse speed is much slower than elsewhere (to the point of useless)" under Mir. The bug describes slow mouse movements, but is expected to be addressed by Mir using libinput.