Separate the major components of HDF5

[A while back, I asked for a way to independently build the major components of HDF5.](https://github.com/HDFGroup/hdf5/issues/3221) Now I think it is the right time to completely break up the major components into their own separate packages. This most obviously applies to the primary language wrappers, but also would work well for supplementals including the manuals and tools.

This move would reduce user install problems for the core C libraries; untangle compiler dependencies; and help segregate debugging by components. I think it would also help the HDF Group to more easily manage individual components, into the future.

If you would like to prioritize, try the fortran wrapper first, 'cuz that is the one that is bugging me the most.