Fzzy Config

New isDev method in PlatformApi for checking if the instance is running in a development environment.
Implemented a barebones Registrar system for platform-agnostic registration of objects. This API is experimental, with scheduled stability by 0.6.0.
- Registers objects into RegistrySupplier instances, much like the (Neo)Forge deferred registry system.
Added onRegisteredClient and onRegisteredServer to the EventApi for listening to config registrations and only acting after the config has been successfully registered.
New version of ValidatedField.validateAndSet, validateAndSetFlagged that accepts EntryFlag.Flag (and inspects the field own flags) and changes set behavior based on flags present.
- EntryFlag.Flag.QUIET: flagged field won't call listeners on change
- EntryFlag.Flag.STRONG: field validateAndSet/validateAndSetFlagged will use strong validation. Weak validation is standard.
- EntryFlag.Flag.UPDATE: field will update its current sync state when the value is set.
Added overload to ValidationResult.report that takes a string consumer directly for immediate reporting of issues.
New Codecs helper class in PortingUtils for handling version-agnostic Packet Codecs. Thanks Mojang.

ConfigApi.isConfigLoaded(scope) has been deprecated in favor of ConfigApi.isConfigLoaded(scope, type). This new overload can check for client configs; the now-deprecated method only checked synced ones.
- Also consider the new register event instead of trying to check for config load yourself.
Scheduled ValidatedEntityAttribute for removal in 0.6.0. It is completely unused as far as I can tell with a github-wide search, and quite an unstable concept in general. If needed, a similar validation can be built for your own usage.