Add datx support

See merge request !23

Simplify deps

See merge request !22

Make version readout future proof

See merge request !21

Add support for floor == -1 DETX bug

See merge request !19

Add readout for mechanics

See merge request !17

This also changes the requirement of HDF5 to be ^0.16.15 because the
`get_package_version()` was used before to check if the package is older
to load a patch.