gst-play: Remove timer GSource from Win32 keyboard handler
gst-play: Handle KeyDown event instead of KeyUp on Win32 keyboard handler
To handle long press case, KeyDown input should be handled instead of KeyUp.
Note that OS will take care of the sensitivity of KeyDown event, so we can safely
assume one KeyDown as one input. That will not break user experience.
gst-play: Remove timer GSource from Win32 keyboard handler
Use WaitForMultipleObjects to handle keyboard input only if pending
keyboard input exists.
Edited by Seungha Yang