Add IsFirst/IsLast methods to match SS5 conventions (closes #1274) #1134

Job	Run time
CI / Generate matrix	13s
CI / Context	1s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	2m 47s
CI / 8.2 mariadb phpunit all	2m 43s
CI / 8.3 mysql80 phpunit all	2m 55s
CI / 8.1 mysql57 phplinting	2m 11s
CI / 8.1 mysql57 endtoend root job1	9m 18s
CI / 8.3 mysql80 endtoend root job1	8m 43s
CI / 8.1 mysql57 endtoend root job2	8m 2s
CI / 8.3 mysql80 endtoend root job2	7m 50s
CI / 8.1 mysql57 endtoend root job3	9m 53s
CI / 8.3 mysql80 endtoend root job3	9m 49s
CI / 8.1 mysql57 endtoend root job4	9m 35s
CI / 8.3 mysql80 endtoend root job4	9m 21s
CI / 8.1 mysql57 endtoend root job5	6m 3s
CI / 8.3 mysql80 endtoend root job5	6m 43s
CI / 8.1 mysql57 endtoend root job6	8m 33s
CI / 8.3 mysql80 endtoend root job6	8m 0s
CI / 8.1 mysql57 endtoend root job7	11m 28s
CI / 8.3 mysql80 endtoend root job7	11m 15s
CI / 8.1 mysql57 js	4m 16s
CI / 8.1 mysql57 doclinting	3m 18s
CI / Dispatch tag patch release	0s
	2h 22m 57s

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