vo_direct3d: implement screenshots

There are 4 code paths when taking a screenshot:
- textured rendering mode
- StretchRect rendering mode with planar formats
- StretchRect with packed formats
- full-window screenshot mode

The implementation of the full-window mode (capturing the window contents,
instead of the video) is very inefficient: it will create a surface of
desktop size, copy the desktop contents, allocate a new memory image, and
copy in the window contents. The code in screenshot.c will (as of now)
allocate and convert the image from BGR to RGB, and allocate a destination
buffer for the libavcodec PNG writer.

If parts of the mplayer window are obscured, the full-window mode wil
contain these parts as seen on the screen. Parts of the window that are
outside the bounds of the desktop are clipped away. It is not known
whether full-window mode works on multi-monitor setups.

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