Array append performance 2

[bearophile]

This is the first beta version, it seems to work well enough (despite too much easy memory overflows), I'll add ddoc comments, better comments, I'll clean the code, improve unit tests, etc. If you spot problems I'd like to know them.
You will probably find its finished version inside my libs in one or two days.
I presume Walter isn't interested to put this into Phobos, nor to 'fix' the built-in arrays  (or maybe he's just busy).

Bye,
bearophile
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