Implement IWriterForApplication: 0 (CreateContextRegistrar)

Coxxsrequested to merge
coxxs/ryujinx:ipc-ectx into master

Fix games that uses ContextRegistrar (e.g. After the socket blocking issue is fixed, Splatoon 3 and other ModuleSystem games will call this when booting, to create a context for the error, after a connection attempt to the server failed.)

Edited by Coxxs

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