Pull in h5cpp as a dependency, supports Conan as well as non-Conan
Created by: dominikwerder
In preparation for the switch to h5cpp, this commit declares for cmake h5cpp and the required dependencies. h5cpp depends on Boost, therefore this is also a dependency now.
Using the new minimal Findh5cpp.cmake we can support Conan-builds as well as non-Conan-builds.