indicated is communication with device is possible

Patched gio-2.0 VAPI files are no longer needed.

Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>

Implement mousepad plugin handler. The input in realized through AT-SPI.

Use Socket.create_socket_source() as it works for both TCP and UDP
sockets, but also does not use GDatagramBased interface, thus should
allow building on systems with older GLib versions.

A message ends with \n (newline), make sure that's the only extra
character we consume.

Replace named constructor Device.from_cache() with static method
Device.new_from_cache() to catch errors when loading from cache and
return null in such case.

IO receive from the mobile can be done synchronously without problems.

Calling Socket.create_source() will generate a C call to
g_socket_datagram_based_create_source(), and that returns null for TCP
sockets. Use a helper Socket.create_socket_source() method to workaround
this problem..

GLib.Socket implements GLib.DatagramBased, hence calling
Socket.create_source() results in a C call to
g_socket_datagram_based_create_source() insted of
g_socket_create_source() as one my expect. The former works only for
datagram based sockets (as implemented in gio/gsocket.c), hence
Socket.create_source() for TCP socket will always return null. To
workaround this, export g_socket_create_source() as
Socket.create_socket_source() method.

The change is expected to be a part of vala 0.34 release.

Due to gio-2.0 VAPI changes Socket.create_source() does not return a
SocketSource anymore, but a standard GLib.Source instead. Make sure that
we cast to SocketSource.

Prevent valac from producing colored output as it breaks Emacs compile
buffer handling and find-file support.

In preparation for DBus move the files to their respective directories.