Added direction parameter to plugin switch_workspace()

To facilitate nicer effects; extended direction defined in workspace.h so we
can represent up-left, etc.

src/core/workspace-private.h

@@ -36,17 +36,6 @@
 #include "workspace.h"
 #include "window-private.h"
 
-/* Negative to avoid conflicting with real workspace
- * numbers
- */
-typedef enum
-{
-  META_MOTION_UP = -1,
-  META_MOTION_DOWN = -2,
-  META_MOTION_LEFT = -3,
-  META_MOTION_RIGHT = -4
-} MetaMotionDirection;
-
 struct _MetaWorkspace
 {
   MetaScreen *screen;