2.0.0+1.20.X

Changes:

• Move mechanic package into api package;
• added CustomPathBlock to lib.block;
• added VelocityCommand;
• update description

What's Changed

• 1.20.X-dev for 2.0.0+1.20.X by @rotgruengelb in #2

Full Changelog: 1.1.0+1.20.X...2.0.0+1.20.X