CMake Toolchain Collection

as I am silently hacking away on osgART and some other software for iOS and Android I also took a bit of a d-tour to create some cleaner toolchain files for CMake. These toolchains try to be cleaner and avoid anoyances as using the Android build system for instance (yes you can do make -j 12 with these) or letting Xcode 4.2 do what it does. Please clone, contribute and report problems via GitHub