Add Encode traits for remaining message types (RustCrypto branch) #158

Job	Run time
Check spelling	7s
Check formatting (ubuntu-latest)	13s
Integration tests (ubuntu-latest)	39s
Clippy lints (ubuntu-latest)	16s
Check formatting (macos-latest)	6s
Integration tests (macos-latest)	1m 3s
Clippy lints (macos-latest)	48s
Check formatting (windows-latest)	8s
Unit tests (ubuntu-latest)	28s
Integration tests (windows-latest, true)	2m 24s
Clippy lints (windows-latest)	1m 40s
Unit tests (macos-latest)	44s
Unit tests (windows-latest)	33s
	9m 9s

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