Also move some previously static functions into their associated classes,
which lets us remove a few unnecessary wrapper functions used for testing.
No change in functionality.
Use git blame dd9a087 to follow the history before this refactoring.
Also move an extra unsupported check out of PRSImport::ImportSummary
into CreateMachineFromProperties, where it should intervene before
reaching PRS1Import. Leave a warning debug message in its place.
Each input file's chunks get emitted into a single output YAML file. As parsing
gets separated from conversion/import, this will allow for testing and
examination of the parsed input files before they are transformed into
sessions.
This has already exposed many limitations, and possibly some memory trampling. Before this will work as
a true regression test, we'll need to address both of those, so that this produces reliable, reproducible
output.
