AVC-Intra support

This format has been reverse engineered and x264's output has almost exactly
the same bitstream as Panasonic cameras and encoders produce. It therefore does
not comply with SMPTE RP2027 since Panasonic themselves do not comply with
their own specification. It has been tested in Avid, Premiere, Edius and
Quantel.

Parts of this patch were written by Jason Garrett-Glaser and some reverse
engineering was done by Joseph Artsimovich.
Raw v210 input support

Assembly based on code by Henrik Gramner and Loren Merritt.
Windows Unicode support

Windows, unlike most other operating systems, uses UTF-16 for Unicode strings while x264 is designed for UTF-8.

This patch does the following in order to handle things like Unicode filenames:
* Keep strings internally as UTF-8.
* Retrieve the CLI command line as UTF-16 and convert it to UTF-8.
* Always use Unicode versions of Windows API functions and convert strings to UTF-16 when calling them.
* Attempt to use legacy 8.3 short filenames for external libraries without Unicode support.