kconfig: Qt interface port to Qt4/Qt5, removed Qt3 Support

* Use Qt designer ui file instead of handwritten ui code
* Use Qt Model/View design
* Qt5 compatibility
* Makefile adopted: Add uic (Qt interface compiler) support.
* Set organisation and application name for QApplication/QSettings.

Signed-off-by: David Graeff <david.graeff@web.de>
kconfig: images.c for gtk/qt gui flavour reoganized

Change order of xpm image constants to build up groups.
Make those groups optional via ifdefs.
Remove not used constants.

Signed-off-by: David Graeff <david.graeff@web.de>
kconfig: Update POTFILES.in to reflect new directory structure.

* Rename lxdialog to menuconfig.
* Add gconfig/qconfig source/ui files.