Update .NET code to .Net 7 and CPP FFMPEG deprecated code fixes

[Zekiah-A]

Also includes some clean-ups to conform modern .Net code style patterns + attempt to update deprecated funcs in CPP source to newer code that works with modern ffmpeg

[eXpl0it3r]

Wouldn't it make more sense for a library to keep things on the current LTS for .NET, which would be .NET 6?

[Zekiah-A]

Wouldn't it make more sense for a library to keep things on the current LTS for .NET, which would be .NET 6?

Fair, fortunately this code should all be .net 6 compatible, but for project compatibility sake, I can go and change the project file so that it will be able to be used with all such .net 6 projects file.

[Zekiah-A]

There are a few other things that I think I would like to see changed in this project, such as making sure this can properly be used as a nuget package, but I'll leave that to a later PR

[eXpl0it3r]

Unfortunately, I'm neither owner nor collaborator, would be great to see some movement on this repo. Maybe @zsbzsb is willing to add you to the repo 🙂