Drop the user-visible separation, make everything just Tuhi. Directory
structure remains largely separate (tuhi vs tuhigui) except for the po files
which are in the top-level directory because convention.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This is a plain subtree merge without any changes to the tuhigui tree itself.
As we'll keep the distinction between the DBus server and the GTK UI, the
directory layout will reflect that.