Ticket #1362 (closed enhancement: fixed)

Fiji had the "Show changes" button in the updater which allowed the uploader to determine what changed and whether it was safe to upload.

However, Fiji did it by detecting whether the Script Editor was present and having some updater-specific code in the Script Editor. This was due to the Script Editor already having dependencies on the Fiji Build System which was used to determine the source paths corresponding to the component in question.

Let's re-implement that functionality without incurring the same amount of technical debt by relying on the Git executable instead. That is, if git (or git.exe) are in the PATH, add the button, and try to determine the source path using git ls-files instead, using ByteCodeAnalyzer's ability to determine the source file and the package name of a class given its bytecode.