Don't use hardcoded unlock levels for Blast Mining
Fix Blast Mining and change its behavior slightly

Fixed bug where Blast Minings ability "Demolition Expert" would not
work with certain CB versions. DanageCause.BLOCK_EXPLOSION was not
passed, ENTITY_EXPLOSION was used instead.

Changed behavior of the Blast Mining ability "Demolition Expert"; now
only decreases damage for the ability user and for Blast Mining
explosions.
Prepare for UUID update
Add u.uuid here
Deprecate methods in ExperienceAPI
UUID Conversion stuff
Deprecate PlayerProfiles relying on names
Add hidden options for uuid conversion
UUID flatfile stuff
Save and load profiles using UUIDs
fall back on usernames if neccesary
Update playername in database when a name changes
Load UUID with SQL
Update to UUIDFetcher v3
Save if uuid conversion is complete in convert.yml