This patch:
- moves PrintDepsWindows folder to `//browser_patches/winldd`
- adds `build.sh`, `archive.sh`, `clean.sh` and `BUILD_NUMBER` to
power builds on buildbots
- starts building `winldd-win64` on windows buildbot
This patch:
- moves ffmpeg binaries from `//bin/` to `//third_party/ffmpeg`
- adds [COPYING.GPLv3](https://github.com/FFmpeg/FFmpeg/blob/master/COPYING.GPLv3)
ffmpeg license
- changes npm packaging to include `//third_party/ffmpeg` only in `playwright` and `playwrihgt-chromium` a
