set proper field access and use mappings
* Towards 1.20 * Init bukkit * Update YAML to 2.0 * Fixes for 1.20 adapters * Update obfuscated field names * Remove getHandle workaround * entityManager is obfuscated * Update paperweight * [ci-skip] Add 1.20 to modrinth task --------- Co-authored-by: Phillipp Glanz <p.glanz@madfix.me> Co-authored-by: SirYwell <hannesgreule@outlook.de>