test

Add diagram generation feature and integrate Railroad Diagrams #1548

Job	Run time
steep-check (head)	43s
check-misc (head)	10s
test-memory (head)	31s
test-ruby (head, master)	1m 6s
test-ruby (3.0, master)	1m 38s
test-windows (head)	3m 0s
ruby-versions / Generate Ruby versions	1s
test-cpp (head, g++)	11s
test-c (head, cc)	12s
test-cpp (head, clang++)	16s
test (2.5)	35s
test-c (head, gcc)	11s
test (2.6)	37s
test-c (head, clang)	17s
test (2.7)	36s
test (3.0)	19s
test (3.1)	25s
test (3.2)	22s
test (3.3)	22s
test (3.4)	29s
test (head)	12s
	12m 13s

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