Fix debug log incosistencies and function naming

[Vitaliy Margolen]

Michael Karcher wrote:
> Debugging DirectDraw reference counting is confusing,
> as the IDirectDraw{,2,3,4}_AddRef methods dump to ddraw_thunk,
> whereas the matching Release methods dump to ddraw. This
> patch changes to consistently use the ddraw channel.
> 
> Furthermore, as the methods from IDirectDraw7 are named
> like "IDirectDrawImpl_Foo", the functions from IDirectDraw
> (Direct Draw 1) get renamed to "IDirectDraw1Impl_Foo" to
> avoid non-unique function names in trace logs.
> ---

Please make it two patches. One to change debug channel. Second to rename 
IDirectDrawImpl into IDirectDraw1Impl.

Vitaliy.