Refactor vala code

Cleanup the vala code of gtk3 panel and tool by:

- using config.vapi
- omitting unnecessary "using X"

Also localize ibus tool and make the argument handling better.

BUG=none

[Peng, 2012-08-31 11:03:03]

https://codereview.appspot.com/6496066/diff/1/tools/Makefile.am
File tools/Makefile.am (right):

https://codereview.appspot.com/6496066/diff/1/tools/Makefile.am#newcode33
tools/Makefile.am:33: AM_CPPFLAGS = -include $(CONFIG_HEADER)
Is it necessary?

https://codereview.appspot.com/6496066/diff/1/tools/main.vala
File tools/main.vala (right):

https://codereview.appspot.com/6496066/diff/1/tools/main.vala#newcode23
tools/main.vala:23: using IBus;
Do not need using config here? And other vala files?

https://codereview.appspot.com/6496066/diff/1/ui/gtk3/application.vala
File ui/gtk3/application.vala (right):

https://codereview.appspot.com/6496066/diff/1/ui/gtk3/application.vala#newcode34
ui/gtk3/application.vala:34:
Intl.bind_textdomain_codeset(Config.GETTEXT_PACKAGE, "UTF-8");
Glib.intl?
It is more clear I think.

[Daiki Ueno, 2012-08-31 21:44:28]

https://codereview.appspot.com/6496066/diff/1/tools/Makefile.am
File tools/Makefile.am (right):

https://codereview.appspot.com/6496066/diff/1/tools/Makefile.am#newcode33
tools/Makefile.am:33: AM_CPPFLAGS = -include $(CONFIG_HEADER)
On 2012/08/31 11:03:03, Peng wrote:
> Is it necessary?

Yes, that is a FAQ:
https://live.gnome.org/Vala/FAQ#I_have_a_config.vapi_binding_for_config.h.2C_...

We could use AM_VALAFLAGS and add "-X '-include $(CONFIG_HEADER)'" as described
there, but I guess we will need extra character escaping especially when
$(top_builddir) contains "'".

https://codereview.appspot.com/6496066/diff/1/tools/main.vala
File tools/main.vala (right):

https://codereview.appspot.com/6496066/diff/1/tools/main.vala#newcode23
tools/main.vala:23: using IBus;
On 2012/08/31 11:03:03, Peng wrote:
> Do not need using config here? And other vala files?

No, vala's using is just to allow programmers to omit the namespace when access.
 If you call all the IBus.* symbols like IBus.foo, you won't need "using IBus":
https://live.gnome.org/Vala/Tutorial/#Namespaces

Also, "using GLib" is vala's default behavior and can be omitted.

https://codereview.appspot.com/6496066/diff/1/ui/gtk3/application.vala
File ui/gtk3/application.vala (right):

https://codereview.appspot.com/6496066/diff/1/ui/gtk3/application.vala#newcode34
ui/gtk3/application.vala:34:
Intl.bind_textdomain_codeset(Config.GETTEXT_PACKAGE, "UTF-8");
On 2012/08/31 11:03:03, Peng wrote:
> Glib.intl?
> It is more clear I think.

Done.

[Peng, 2012-09-03 03:39:41]

Lgtm

https://codereview.appspot.com/6496066/diff/1/tools/main.vala
File tools/main.vala (right):

https://codereview.appspot.com/6496066/diff/1/tools/main.vala#newcode23
tools/main.vala:23: using IBus;
I see. Seems all using could be removed
On 2012/08/31 21:44:29, Daiki Ueno wrote:
> On 2012/08/31 11:03:03, Peng wrote:
> > Do not need using config here? And other vala files?
> 
> No, vala's using is just to allow programmers to omit the namespace when
access.
>  If you call all the IBus.* symbols like IBus.foo, you won't need "using
IBus":
> https://live.gnome.org/Vala/Tutorial/#Namespaces
> 
> Also, "using GLib" is vala's default behavior and can be omitted.