Make the ActionAliasMigrator use a Path, and add a basic
unit test. Need to make ConfigFile use paths to do anything
sensible.
Also refresh gradle libs in idea so JimFs shows up.
Change-Id: I0cb2692083d0fe117b91edce63d8417ddd74e288
Reviewed-on: http://gerrit.dmdirc.com/3999
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>