Drop-in Windows Build, PySceneDetect integration

• PySceneDetect integrated, less complexity, faster.
• Autobuilds for Windows Executable at Appveyor.
• Windows builds only require FFmpeg, FFprobe, Encoder in main folder with executable.
• At current moment Working Encoders for Windows are AOM (Full), Rav1e ( 1-pass, 2 pass is bugged), SVT-AV1 don't want to work with pipes at all :(
• Attached files are ready to use and contain latest Rav1e and Aom

Av1an 1.2 - Full FFmpeg, PyScene options, Major bugfixes

• Major fix for AOM/SVT-AV1 droping encoded frames on some sources.
• Now supporting all FFmpeg options with -ff
• Now supporting all PySceneDetect options with -sc
• and some more

Av1an 1.1 - Less dependencies, Reuse of detected scenes

• Fully redone video splitting. FFmpeg segment used instead of scenedetect pymkv
• Reusing scenedetect results with different runs for same video. Look -s for instructions
• Removed dependence on python-pymkv
• Cleaner console look, less lines, better presenting of useful information
• Fixed printing of large amount of output to Windows console
• Better error handling

Initial release with main functionality

• Spliting Video by Scenes

• 8/10 bit encoding

• AOMENC encoding 1,2 pass.

• SVT-AV1 encoding 1,2 pass.

• Rav1e encoding 1 pass only.

• Avif AOMENC encoding.

• Avif Rav1e encoding.