lib: introduce uloop binding

The uloop module allows controlling the uloop event loop and supports adding
timeouts, processes and file descriptors.

Example:

    #!ucode -RS

    let fs = require("fs");
    let uloop = require("uloop");

    let fd1 = fs.popen("echo 1; sleep 1; echo 2; sleep 1; echo 3", "r");
    let fd2 = fs.popen("echo 4; sleep 1; echo 5; sleep 1; echo 6", "r");

    function fd_read_callback(flags) {
    	if (flags & uloop.ULOOP_READ) {
    		let line = this.handle().read("line");

    		printf("Line from fd <%s/%d>: <%s>\n",
    			this, this.fileno(),
    			trim(line));

    	}
    }

    uloop.init();

    uloop.timer(1500, function() {
    	printf("Timeout after 1500ms\n");
    });

    uloop.handle(fd1, fd_read_callback, uloop.ULOOP_READ);
    uloop.handle(fd2, fd_read_callback, uloop.ULOOP_READ);

    uloop.process("date", [ "+%s" ], { LC_ALL: "C" }, function(exitcode) {
    	printf("Date command exited with code %d\n", exitcode);
    });

    uloop.run();

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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