wininet: Add a URLCache_FindEntryInHashW helper, and use it to simplify finding an entry in a hash with a wide-character URL string.

These mean that the file should have full permissions for everyone.

winex11.drv: Remove the coloruse == -1 special case. Add X11DRV_DIB_GetColorCount() for computing a bitmap's number of colors.

crypt32: Don't keep a pointer to the lower quality chains when choosing a higher quality one, otherwise they'll get double-freed.