Initial commit for QML slideshow support.

CMakeLists.txt

src/branding/default/branding.desc

src/branding/default/show.qml

src/libcalamaresui/Branding.cpp

src/libcalamaresui/Branding.h

src/libcalamaresui/CMakeLists.txt

src/libcalamaresui/InstallationViewStep.cpp

src/libcalamaresui/InstallationViewStep.h

src/libcalamaresui/slideshow/CMakeLists.txt

src/libcalamaresui/slideshow/Presentation.qml

src/libcalamaresui/slideshow/Slide.qml

src/libcalamaresui/slideshow/qmldir