#578: Update to FFmpeg 7.0.2

[williamwira]

Linked issues

Fixes #578

Summarize your change.

Upgrade FFmpeg to 7.0.2, and resolve build-time errors and deprecation warnings.

Describe the reason for the change.

Maintenance Update

Describe what you have tested and on which operating system.

MacOS

Add a list of changes, and note any that might need special attention during the review.

MovieFFMpeg ffmpeg.cmake

To Test

Open RV, load an H.264 QuickTime video file. Confirm the video loads and can be played.

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