Add support for timestamp encoding in exemplars #947

Job	Run time
Check	1m 35s
Test Suite	1m 37s
Rustfmt	19s
Clippy	1m 23s
Check rustdoc intra-doc links	27s
Cross compile (wasm32-unknown-unknown)	18s
Cross compile (armv7-unknown-linux-gnueabihf)	20s
Cross compile (powerpc-unknown-linux-gnu)	20s
Cross compile (powerpc64-unknown-linux-gnu)	22s
	6m 41s

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