v3.0.0

• Dart!
• Speed
• Consistency - it is well known what script does, what does it copy and what not
• Stable album detection (tho still don't know what to do with it)
• Testing!
• Better json matching
• --guess-from-name is now a default
• --skip-extras-harder is missing for now
• --divide-to-dates is missing for now
• End-to-end tests are gone, but they're not as required since we have a lod of Units instead 👍