Enable nullability

[Regenhardt]

Enabling nullability will make it easier to not accidentally pass something potentially uninitialized and also simpler to see at what point we don't have to null-check everything.

I guess immediately enabling it globally would make a mess so maybe start with enabling it in BaGetter.Protocol and putting question marks where needed, then BaGetter.Core, then look how far that branch goes without getting tired.

Just make a commit per project converted so we can merge early in order to minimize interference.

[seriouz]

I am pro on this. Because I personally like nullability very much, guarding us of Object reference not set to an instance of an object 😅.
Walking through each project sounds very logically.

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