Initial, simple implementation of saving per-session history #1200

Job	Run time
Ensure 'cargo fmt' has been run	9s
Documentation checks	5m 31s
Extract crate metadata	3s
WASM version	2m 6s
Minimum supported rust version	1m 55s
aarch64-unknown-linux-gnu (ubuntu-20.04)	3m 30s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	3m 37s
arm-unknown-linux-musleabihf (ubuntu-20.04)	4m 29s
i686-pc-windows-msvc (windows-2019)	7m 53s
i686-unknown-linux-gnu (ubuntu-20.04)	3m 42s
i686-unknown-linux-musl (ubuntu-20.04)	3m 46s
x86_64-apple-darwin (macos-12)	4m 31s
x86_64-pc-windows-msvc (windows-2019)	5m 42s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 26s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 47s
	54m 7s

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