And rename it to VideoBackendBase because of conflicts within the backends itself.

This reverts commit 81414b4fa2edadf0b2a2bb0bd4df61dd59165eec, reversing
changes made to b926061f641692ae31bacbeba304f5941db7d3bc.

Conflicts:
	Source/Core/DolphinWX/Frame.cpp
	Source/Core/VideoCommon/VideoConfig.cpp
	Source/Core/VideoCommon/VideoConfig.h

It reduces redundancy. Needed make possible to save current video config.

This is effectively unused, as the window handles that we pass to the
GLInterface are window handles for the frame which isn't ever a real
toplevel window. Host_UpdateTitle is what actually sets the proper title
on the render window.

Now that MainNoGUI is properly architected and GLX doesn't need to
sometimes craft its own windows sometimes which we have to thread back
into MainNoGUI, we don't need to thread the window handle that GLX
creates at all.

This removes the reference to pass back here, and the g_pWindowHandle
always be the same as the window returned by Host_GetRenderHandle().

A future cleanup could remove g_pWindowHandle entirely.

All it did was raise complexity.

Also changes some function params, but this is ok.
Some simplifications were also able to be made (ie. killing off strcmps with ==, etc).