Fix debug log incosistencies and function naming

[Michael Karcher]

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.
---
 dlls/ddraw/ddraw_thunks.c |  103 ++++++++++++++++++++++-----------------------
 1 files changed, 51 insertions(+), 52 deletions(-)
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