Enhance Lookup API

[Phoupraw]

• Added preliminary providers, which are called before all other providers.
• You can register multiple providers for one item/block/entity type now.
• Fallback providers list is replaced by Event, where you can add phase ordering.
• All the changes are backward compatible. Some methods are marked with @Deprecated.

[Technici4n]

I don't like this PR, it seems like a bunch of random opinionated changes, and many go against my original design. I would like each change to be submitted separately, and with a motivating use case for each.