Field serialisation utilities

Significant contributions

This release includes field serialisation utilities that allow a field to be written to or read from an HDF5 file, contributed by @piotrows in #99

Smaller contributions and fixes

• Return dummy allocation for 0-sized fields in FIELD_ACCESS_MODULE by @awnawab in #106
• Update deprecated pinning flag by @awnawab in #107

New Contributors

• @piotrows made their first contribution in #99

Full Changelog: v0.3.6...v0.3.7