Add a networking API

[benhj]

Wondering about networking builtins, e.g.:

http_read("http://server/path/something.dat") -> bytes;

[benhj]

http_read itself is complete on the experimental branch and can be used as written above. It uses CURL though and I'm not sure how ideal this is.. The functionality is only built if the CURL headers and libraries can be found by cmake.

Example usage to download a file (for example) would be something like:

http_read("https://slashdot.org") -> file("/Users/bjones/slashdotTest.html");

The 'return type' is an array of bytes. Above, a file receiver is shown to write the returned bytes directly to a file.

[benhj]

Didn't mean to close :-D