Merged clipboard driver into USER driver.
Moved all ttydrv source files to dlls/ttydrv.
Load functions pointer for the USER driver from the graphics driver
dll with GetProcAddress.

diff --git a/dlls/user/mouse.c b/dlls/user/mouse.c
index a74a8a3..1d8371d 100644
--- a/dlls/user/mouse.c
+++ b/dlls/user/mouse.c
@@ -63,7 +63,7 @@
 {
     THUNK_Free( (FARPROC)DefMouseEventProc );
     DefMouseEventProc = lpMouseEventProc;
-    USER_Driver->pInitMouse( lpMouseEventProc );
+    USER_Driver.pInitMouse( lpMouseEventProc );
 }
 
 static VOID WINAPI MOUSE_CallMouseEventProc( FARPROC16 proc,
@@ -100,5 +100,5 @@
 {
     THUNK_Free( (FARPROC)DefMouseEventProc );
     DefMouseEventProc = 0;
-    USER_Driver->pInitMouse( 0 );
+    USER_Driver.pInitMouse( 0 );
 }