Implement (barely) and test block inventory rendering. #634

Job	Run time
incremental-mutants	0s
miri	1m 35s
deny	45s
build (ubuntu, stable, locked, true)	12m 51s
no_std	36s
build (windows, stable, locked, false)	26m 42s
build (macos, stable, locked, false)	10m 43s
build (ubuntu, nightly, locked, false)	23m 8s
build (ubuntu, beta, locked, false)	13m 39s
build (ubuntu, stable, latest, false)	16m 24s
build (ubuntu, stable, minimal, false)	2m 25s
fuzz	15m 52s
features	29m 48s
deploy	4s
	2h 34m 32s

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