test

Add diagram generation feature and integrate Railroad Diagrams #1552

Job	Run time
steep-check (head)	14s
check-misc (head)	12s
test-memory (head)	39s
test-ruby (head, master)	5m 28s
test-windows (head)	1m 49s
test-ruby (3.0, master)	6m 21s
ruby-versions / Generate Ruby versions	4s
test-cpp (head, g++)	14s
test-c (head, cc)	11s
test-cpp (head, clang++)	14s
test (2.5)	33s
test-c (head, gcc)	13s
test (2.6)	38s
test-c (head, clang)	13s
test (2.7)	36s
test (3.0)	19s
test (3.1)	21s
test (3.2)	25s
test (3.3)	22s
test (3.4)	26s
test (head)	13s
	19m 45s

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