Implementing namespaces for Kohana Core and later modules about core

[enov]

👍

[acoulton]

👍 would ideally like to see this come with a script to add relevant use statements to end-user code files for quick upgrade.

[JackEllis]

Hell yes, lack of namespaces is really annoying!

[Ikke]

👍

[rjd22]

@enov @acoulton @Ikke I started working on this in the following branch. #663

I'm taking small steps so the tests won't fail and the merge will be easier. There are some classes that are hard to convert like the UTF8 class so that might need some more work.

Could you please check this PR to see if it's going into the right direction?

[enov]

Thanks for the hard work @rjd22.