Sync Re-Re-Ported

Fixes

• Sync no longer causes a server crash in multiplayer (from https://github.com/cassiancc/sync-fabric).
• Completed shells in the shell constructor are now valid destinations to sync to upon death, instead of only shells in storage.
• Mekanism power sources should now work with the shell constructor.
• Shell storage no longer requires a power source when the shellStorageConsumption is set to 0 in the config.

Full Changelog: https://github.com/pawjwp/sync-fabric/commits/mc1.20-5.0