FFmpeg Self Grab

[Adam-Kay]

Long overdue overhaul of the system that finds and uses FFmpeg.

Functions and related issues:

• Detect if FFmpeg is in the same folder
  • Fixes Program should detect FFmpeg if it's in the same folder #3
• Use FFmpeg from PATH if available
  • Fixes Program should use FFmpeg from PATH #4
• Add ability for program to download FFmpeg itself via WinGet
  • Fixes Program should be able to download FFmpeg #25
  • Add alternative download also in case WinGet is unavailable (see here)

[Adam-Kay]

Depending on the decided priorities, it would be good to merge in the changes from main before continuing work on this, to ensure that code changes to master and eventual merging in from #48 does not interfere with the new code.

This can be done one of two ways:

Rebase

Will move the starting point for the branch to be the current tip of main. Technically is rewriting history.

git checkout <branch-name> && git rebase main

Merge

Will merge in changes from main to the current point.

git checkout <branch-name> && git merge main