gst/games/gstpuzzle.c: make RGB endianness work correctly refactor and fix race with initial shuffling allow using th...

Original commit message from CVS:
* gst/games/gstpuzzle.c: (gst_puzzle_base_init):
make RGB endianness work correctly
(gst_puzzle_show), (gst_puzzle_swap), (gst_puzzle_move):
refactor and fix race with initial shuffling
(nav_event_handler):
allow using the mouse to puzzle
(draw_puzzle):
insist on tiles having width and height as multiples of 4 to get
clean YUV image handling
* sys/xvimage/xvimagesink.c: (gst_xvimagesink_xvimage_new),
(gst_xvimagesink_handle_xevents), (gst_xvimagesink_buffer_alloc):
s/DEBUG/LOG/ for common messages
(gst_xvimagesink_navigation_send_event):
fix mouse event translation to not include screen PAR
* sys/ximage/ximagesink.c: (gst_ximagesink_navigation_send_event):
fix mouse event translation to actually work