Update CMakeLists to modern practices #68
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Modern CMake allows target's properties to be imported recursively.
This repository was using a combination of CMake targets and explicit
path references, which is undesirable.
It now uses targets for all dependencies, and the dependencies config
is now in a separate file for manageability.
This has been tested on Debian, CMake 3.7.2
TODO: Further testing and maybe update CMake minimum version.