Generalize affected packages names lookup

Implement configurable options for snapshot importance

Use Git info in RPM pkg release

Store actions summary in description

Don't list replaced packages in userdata

Avoid pointers in plugin class fields

Clarify "transaction SCD" method name

Update readme with basic info

Don't use libdnf5 namespace

Mark as important if has installonly pkgs

Mark snapshot as important if has protected pkgs

Store only action N in snapshot meta

Add Github CI

Add RPM spec

Cleanup by number