Add cmake external projects for all dependencies
Qt is supposed to be built/installed separately because building Qt from a complex cmake externals tree almost always fails somewhere. Also missing are curl and libssh2 which are optional dependencies for g'mic. poppler/freetype/fontconfig doesn't work on Linux yet, fontconfig cannot find a locally installed freetype. The internal dependencies graph isn't really filled in yet, because trying to build all deps in one almost always fails anyway -- better build the deps by hand or provide your own bat or sh script for that. This now works on Linux; check 3rdparty/description for a small howto. Next phase are adapting to OSX and Windows...
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