Change Eagle file importer to use a two pass import. The first pass
parses the entire Eagle file into an associated E* object. The second
pass converts the parsed E* objects into the appropriate KiCad objects.
Improve handling of Eagle versioned libraries.
Add helpers to IO_BASE to ease handling of PROGRESS_REPORTER and REPORTER
objects.
ADDED: Support for importing Eagle schematic modules.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/1813
The IO_RELEASER is a thin-wrapper around a std::unique_ptr, but done
this way to allow easier addition of a custom deleter in the future if
something needs to call back into the IO_MGR.
Wayne Stambaugh
Seth Hillbrand
Ian McInerney