files generated by erc/drc preflight options

[matthiesenj]

I have noticed that enabling erc/drc in preflight causes a couple of txt and a filter file is generated.
These files end up in the path specified by -d when using kicad_auto:latest, and in the path specified by the "dir" directive in the global section when using kicad_auto:dev.

-Is this difference on purpose?
-Are these files considered temporary files?

[set-soft]

-Is this difference on purpose?

As the CHANGELOG.md says Now the global dir option also applies to the preflights, can be disabled using use_dir_for_preflights.
for more information consult #292 (488f2dc)

-Are these files considered temporary files?

Nope, these are the KiCad outputs, they could contain more information than the one collected by KiAuto/KiBot.