app,io/pointer: [API] remove CursorNameOp and rename CursorName -> Cursor

It's now possible to directly user pointer.Cursor to add to the ops.

   pointer.CursorText.Add(gtx.Ops)

This is an API change. Use pointer.Cursor directly instead of CursorNameOp.

Signed-off-by: Egon Elbre <egonelbre@gmail.com>

app/window.go

@@ -69,7 +69,7 @@ type Window struct {
 	delayedDraw  *time.Timer
 
 	queue       queue
-	cursor      pointer.CursorName
+	cursor      pointer.Cursor
 	decorations struct {
 		op.Ops
 		Config
@@ -334,13 +334,6 @@ func (w *Window) WriteClipboard(s string) {
 	})
 }
 
-// SetCursorName changes the current window cursor to name.
-func (w *Window) SetCursorName(name pointer.CursorName) {
-	w.driverDefer(func(d driver) {
-		d.SetCursor(name)
-	})
-}
-
 // Run f in the same thread as the native window event loop, and wait for f to
 // return or the window to close. Run is guaranteed not to deadlock if it is
 // invoked during the handling of a ViewEvent, system.FrameEvent,