Integrate 3rdparty libraries into build system

Based on #44 and includes `dyncall`, `libuv` and `linenoise`.

Works with MSVC, but needs testing/fixing on other platforms (Linux, *BSD and Darwin tentatively supported).

As with #44, the interesting bits are [`build/Makefile.in`](https://github.com/gerdr/MoarVM/blob/gerdr/integration/build/Makefile.in) and [`Configure.pl`](https://github.com/gerdr/MoarVM/blob/gerdr/integration/Configure.pl).