Rust

Create custom HTML formatters. #1237

Job	Run time
build_bin_spec (nightly)	26m 56s
build_wasm (nightly)	53s
build_bin_spec (beta)	1m 0s
build_lib_test (nightly)	50s
build_wasm (beta)	49s
clippy_format	2m 57s
build_bin_spec (stable)	55s
build_lib_test (beta)	1m 4s
build_wasm (stable)	45s
build_bin_spec ($MSRV)	3m 17s
build_lib_test (stable)	1m 1s
build_wasm ($MSRV)	3m 9s
build_lib_test ($MSRV)	3m 31s
lockfile	1m 1s
no_features_build_test (nightly)	29s
no_features_build_test (beta)	25s
no_features_build_test (stable)	20s
no_features_build_test ($MSRV)	2m 48s
	52m 10s

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