🌍 #376 Fix conversion exception when a generator error couldn't be re…

…solved

🚧 Fix some crossplatform tests

Upgrading to .NET 7 doesn't help, it's a problem with the tests. Rollback that change, as .NET 6 is LTS.

A string might encode differently on different platforms with GZip, but it'll decode the same on any platform.

🌍 #376 Simplify internals of error iterations by removing NextParamet…

…ers from common interface (errors are terminal, next params are meaningless)

🌍 #371 Support structs!

🌍 #363 Look for global config only in test assembly, not the entire a…

…pp domain

🌍 #367 Support analyzers for GenSnapshot

🌍 #343 Nullability enhancements I had in a dream

Big tidy up: individual gen handlers now don't need to handle nulling gens themselves, they just push the nullability info into the context, and then nullability is handled by the NullableGenHandler.

Use this to add nullability to array types (another special case).

🌍 Fix crashes when something is accessing concurrently (part 2)

🌍 Fix crashes when something is accessing concurrently

🌍 Fix synchronous properties printing