qpgui.h - remove definition of qpgui class

Signed-off-by: Tony Camuso <tony@camusofamily.com>
qpgui.pro - remove ancient cruft

Signed-off-by: Tony Camuso <tony@camusofamily.com>
gpgui.cpp - gpgui class is not needed for the static library

File was deleted from the project.

Signed-off-by: Tony Camuso <tony@camusofamily.com>