The SXMO (sway) environment expects that the on-screen keyboard does not
handle visibility by itself. Add a new target that ignores the program's
own show/hide requests and shows the keyboard on startup.
It should be possible to build both Wayland (sans D-Bus) and GNOME
versions simultaneously. Add a Wayland target, and, for consistency,
rename the GNOME target.
The D-Bus interfaces used by Phosh are org.gnome.SessionManager for
recovering critical services from crashes and sm.puri.OSK0 for manual
on-screen keyboard activation. Add support for them.
