- use cmake to build client-qt (client's cmake includes global installation support)
- copy-runtime-files.py is no longer necessary since it is directly managed by cmake
- uninstall revision: use make uninstall rule for lrc, client-qt and client-gnome
- add doxygen and graphviz dependencies for building documentation

Change-Id: I3fb1d56cb80556337b2c10fda1a67f84c290158c