Replace JSON11-produced hex escape codes with unicode escape codes #2296

Job	Run time
integration-test-compatibility (true, 1.1.0)	40s
integration-test-compatibility (true, 1.2.0)	55s
integration-test-compatibility (true, 1.2.1)	46s
integration-test-compatibility (true, 1.2.2)	42s
integration-test-compatibility (true, 1.2.3)	44s
integration-test-compatibility (true, 1.2.4)	40s
integration-test-compatibility (true, 1.3.0)	56s
integration-test-compatibility (true, 1.3.1)	59s
integration-test-compatibility (true, 1.3.2)	46s
integration-test-compatibility (true, 1.3.3)	49s
integration-test-compatibility (true, 2.0.0)	41s
integration-test-compatibility (true, 2.0.1)	43s
integration-test-compatibility (false, 1.1.0)	57s
integration-test-compatibility (false, 1.2.0)	51s
integration-test-compatibility (false, 1.2.1)	48s
integration-test-compatibility (false, 1.2.2)	51s
integration-test-compatibility (false, 1.2.3)	1m 2s
integration-test-compatibility (false, 1.2.4)	1m 2s
integration-test-compatibility (false, 1.3.0)	49s
integration-test-compatibility (false, 1.3.1)	1m 3s
integration-test-compatibility (false, 1.3.2)	1m 6s
integration-test-compatibility (false, 1.3.3)	53s
integration-test-compatibility (false, 2.0.0)	51s
integration-test-compatibility (false, 2.0.1)	48s
	20m 22s

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