Rust

html: move core out of macro, dispatch with fn ptr. #1238

Job	Run time
lockfile	1m 8s
build_wasm (nightly)	45s
build_bin_spec (nightly)	26m 45s
build_wasm (beta)	46s
no_features_build_test (nightly)	24s
build_bin_spec (beta)	1m 5s
no_features_build_test (beta)	27s
build_bin_spec (stable)	55s
no_features_build_test (stable)	20s
build_wasm (stable)	48s
build_bin_spec ($MSRV)	3m 15s
no_features_build_test ($MSRV)	2m 38s
build_wasm ($MSRV)	3m 11s
build_lib_test (nightly)	55s
clippy_format	2m 53s
build_lib_test (beta)	1m 8s
build_lib_test (stable)	57s
build_lib_test ($MSRV)	3m 28s
	51m 48s

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