Add config to disable book/barrier registration, add null checks

[sisby-folk]

would close #235 as completed.

Adds a heracles-common-options.json that allows disabling the registration of the quest book and barrier.

The primary purpose for this is modpack and server flexibility. Configured right, this lets vanilla clients connect to a heracles server, as well as completely remove quest barriers from /fill and the book from /give. FTB struggles from a lot of feature bloat - and we consider its set of knicknacks in the registry to be part of that, so if we continue to use heracles, we'll use it with these configs off - merged or hardfile forked.

Cases Tested:

• On Client / On Server: Normal operation
• Off Client / Off Server: No blocks / items, items do not show up in /give, blocks to not show up in /fill.
• On Client / Off Server: Connects fine. Recipe viewers will show book/barrier but their give commands naturally fail.
• Off Client / On Server: Registry mismatch
• Vanilla Client / Off Server: Works. No GUI or toasts obviously - could set up server-based UI in this config.
• Vanilla Client / On Server: Unsupported vanilla client.
• Vanilla Client / 1.1.13 Server: Unsupported vanilla client.
• Vanilla Client / 1.1.12 Server: Unsupported vanilla client.

Limitations:

• Off Client / On Server case causes a mismatch.
• (#208) Configs are a mess so the added one is a mess
• Code has to think about whether blocks/items are null (could be optional to flag this better)

[CodexAdrian]

Like I said, this isnt something we want to do. If feature bloat is a genuine concern, then a better solution would be to separate out this feature into a new module, not make them configurable. Thats something we'd be willing to do when Heracles gets ported to 1.21

[sisby-folk]

I'd definitely be happy with a split solution - it seems like y'all are interested in making the GUI optional as well for the vanilla client case, so it makes sense. We'll probably just leave our pack on 1.1.12 unless there's a fix we really need for 1.20 - then we can merge that into this and it's all dandy anyway.