Only qt4 is guaranted to compile and work. I did not remove gtk and qt3 lyx_gui.C because they might be needed for reference to complete the header declarations in "GuiApplication.C".
- lyx_gui::use_gui transfered to lyx::use_gui in lyx_main.C
- all remaining lyx_gui functions transfered to Application and corresponding GuiApplication implementations.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15306
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