Ensure array_type has front() method + fix array_type on jsoncpp (#361) #597

Job	Run time
custom-install-win	3m 8s
default-linux	6s
custom-install-linux	6s
default-linux-with-examples	13s
default-win	3m 46s
min-req	9m 2s
no-base64	10s
no-pico	11s
preset-support-but-not-enough	11m 52s
root-hint-install-linux	11s
with-libressl	1m 21s
with-wolfssl	49s
with-hunter	3m 11s
	34m 6s

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