GSubprocess: New class for spawning child processes

There are a number of nice things this class brings:

0) Has a race-free termination API on all platforms (on UNIX, calls to
   kill() and waitpid() are coordinated as not to cause problems).
1) Operates in terms of G{Input,Output}Stream, not file descriptors
2) Standard GIO-style async API for wait() with cancellation
3) Makes some simple cases easy, like synchronously spawning a
   process with an argument list
4) Makes hard cases possible, like asynchronously running a process
   with stdout/stderr merged, output directly to a file path

Much rewriting and code review from Ryan Lortie <desrt@desrt.ca>

https://bugzilla.gnome.org/show_bug.cgi?id=672102

gio/gio.h

@@ -126,6 +126,8 @@
 #include <gio/gsrvtarget.h>
 #include <gio/gsimpleproxyresolver.h>
 #include <gio/gtask.h>
+#include <gio/gsubprocess.h>
+#include <gio/gsubprocesslauncher.h>
 #include <gio/gtcpconnection.h>
 #include <gio/gtcpwrapperconnection.h>
 #include <gio/gtestdbus.h>