[qtgui porting] Imported most of qtgui files from Sourceforge QtRoot to gui/qtgui.
[qtgui porting] Fixed a typo in RootBuildOptions.cmake
[qtgui porting] Fixed more typos in RootBuildOptions.cmake
[qtgui merging] Moved recent changes from qtroot to qtgui.
[qtgui merging] Removed remaining qtgui additions from qtroot. Builds.
[qtgui merging] CMake changes.
[qtgui merging] Removed TQtMmlTextProxy
[qtgui merging] build config fixes.
[qtgui merging] Loads of changes and hacks.
[qtgui merging] Small changes. gtgui builds, but much of the functionality is not available (see Qt3ToQt5PortingHelpers.h for major part of TODOs)
[qtgui merging] Added automatic detection of qtgui as GUI factory.