win32: fix window creation and size handling

This commit fixes various issues with the way the window position and
size is setup. Most importantly, it fixes some bugs with restoring from
fullscreen state.

Rename create_rendering_context() to reinit_window_state(). This function
doesn't create anything, it just sets the window bounds and styles.

Do not use vo_dx/dy for the window position, as video_out.c overwrites it
with each vo_config() call. Use private variables window_x/y instead.

A big cause for issues was that reinit_window_state() accidentally cleared
the WS_VISIBLE style. I suspect that the API call to temporarily hide the
window was a hack to deal with this. Another bug was that the window style
was changed without calling SetWindowPos with SWP_FRAMECHANGED (as the
MSDN documentation says).

Properly initialize window position and size on vo_config following the
same rules as the x11 backend:

- Never change the window position. The window position should be kept, as
  the user might move the window, and resetting the window position e.g.
  during ordered chapter playback is not desired.
- Never change the window size, unless the size of the video changes.

These rules don't apply to fullscreen. When switching from fullscreen to
windowed mode, the backend should restore the previous windowed size and
position. When the VO was reconfigured during playback (vo_config() etc.),
the saved window position and size should be changed according to the
rules above, even if the window was in fullscreen mode during
reconfiguring.

Note that these rules might be perceived as awkward by some users: if you
play multiple files with different resolutions, the window won't be
centered when playing the files after the first. This is not a bug.

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