gsubprocess: Fix up communicate

We weren't closing the streams after we were done reading or writing,
which is kind of essential.  The easy way to fix this is to just use
g_output_stream_splice() to a GMemoryOutputStream rather than
hand-rolling it.  This results in a substantial reduction of code
complexity.

A second serious issue is that we were marking the task as complete when
the process exits, but that's racy - there could still be data to read
from stdout.  Fix this by just refcounting outstanding operations.

This code, not surprisingly, looks a lot like the "multi" test.

Next, because processes output binary data, I'd be forced to annotate
the char*/length pairs as (array) (element-type uint8).  But rather than
doing that, it's *far* simpler to just use GBytes.

We need a version of this that actually validates as UTF-8, that will be
in the next patch.

gio/gsubprocesslauncher.h

@@ -101,7 +101,7 @@ void                    g_subprocess_launcher_take_stderr_fd            (GSubpro
                                                                          gint                   fd);
 
 GLIB_AVAILABLE_IN_2_40
-void                    g_subprocess_launcher_pass_fd                   (GSubprocessLauncher   *self,
+void                    g_subprocess_launcher_take_fd                   (GSubprocessLauncher   *self,
                                                                          gint                   source_fd,
                                                                          gint                   target_fd);