- Added `Stream? IVideo.GetStream()` and `Stream? IVideoFile.GetStream()` to the plugin abstraction, so plugins can more easily get a file stream to use through the abstraction instead of needing to rely on the `System.IO` in their code. We'll handle the lifting for you.

- Enabled nullable on the `SVR_VideoLocal_Place` file, marking any fields that should be nullable as nullable and fixing the nullable warnings that popped up as a result of this change. Also removed some left-over fields from older code that is no longer used (0 references).