Release v0.3.0-stable

Works with 1.7.0 and 1.7.1

What's Changed

• World border is disabled in gyms dimension now (istg mojang, 6 mixins?)
• Client config settings are now overriden by server settings, just in case
• ignoredSpecies and ignoredForms config fixed
• Migration to MojMap from Yarn
• Codebase split into common and fabric modules
• Fixed an assortment of persistence errors as stepping stone to full persistence
• Fixed an assortment of disconnect errors

Full Changelog: https://github.com/gitoido-mc/rad-gyms/compare/v0.3-beta.1...1.7.0+0.3.0-stable