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* use varints for delimiting plaintext 2.0 msgs

* lower size limit, fix comment

* go mod tidy - rm unused msgio dependency

* bring back plaintext 2.0.0 with new constructor

* fix deprecation comment

* rm unused context argument

* only check remote id validity if we actually have keys

* bring back msgio & simultaneous read/write

This reverts commit b5729d89.

* add plaintext/2.0.0 (with ugly protoc hack)

* gofmt

* gofmt (for real this time)

* add `go_package` option to proto files

* Revert "add `go_package` option to proto files"

5a543a79bd89d75c9697f852638b8fe56da862f4

* less hacky protobuf imports

* add doc comment for PublicKeyFromProto

* clean up handshake

* go fmt, lol

* use network.MessageSizeMax for ggio reader