Remove unused constants COMPACT_NOTE_SIZE, NOTE_PLAINTEXT_SIZE, ENC_C… #65

Job	Run time
Bitrot check	2m 15s
Build target wasm32-wasi	2m 25s
Latest build on ubuntu-latest	20s
Clippy (MSRV)	2m 26s
Latest build on windows-latest	51s
Latest build on macOS-latest	18s
Intra-doc links	2m 23s
Rustfmt	14s
Test on ubuntu-latest	2m 17s
Test on windows-latest	3m 33s
Test on macOS-latest	2m 6s
	19m 8s

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