Adding an `alloc_array` function #1133

Job	Run time
windows, with c++	4m 18s
windows, all features disabled	3m 42s
windows, debug	4m 46s
windows, release	4m 55s
windows, release, single file library	4m 13s
windows, release, static library	5m 44s
windows, release, sqlite3 source	5m 43s
	33m 21s

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