Version History opens full release notes (changelog) if informed

[aonez]

Addition to #1877 & #1989.

If informed in the appcast item, fullReleaseNotesLink will be used as the Version History (#1877) action instead of releaseNotesLink.
It will only be used if the delegate standardUserDriverShowVersionHistoryForAppcastItem (#1989) is not implemented.

• Lacks Tests because I'm not sure of the need in this specific case.
• Lacks generate_appcast code yet. Since this is a link that will open in the default browser I'm not sure it needs localization. Usually websites already detect the preferred language and show the appropriate content.

Checklist:

• My change is being tested and reviewed against the Sparkle 2.x branch. New changes must be developed on the 2.x development branch first.
• My change is being backported to master branch (Sparkle 1.x). Please create a separate pull request for 1.x, should it be backported. Note 1.x is feature frozen and is only taking bug fixes, localization updates, and critical OS adoption enhancements.
• I have reviewed and commented my code, particularly in hard-to-understand areas.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• My change is or requires a documentation or localization update

Testing

I tested and verified my change by using one or multiple of these methods:

• Sparkle Test App
• Unit Tests
• My own app
• Other (please specify)

macOS version tested: 11.6.1 (20G224)

[aonez]

As stated:

Lacks generate_appcast code yet. Since this is a link that will open in the default browser I'm not sure it needs localization. Usually websites already detect the preferred language and show the appropriate content.

Since I'm not sure how to proceed there, I prefer to wait and discuss or leave it to others to finish that part.

[zorgiepoo]

This looks good, thanks! I may make some minor post documentation edits later.

Lacks Tests because I'm not sure of the need in this specific case.

I wouldn't worry about this.

Lacks generate_appcast code yet. Since this is a link that will open in the default browser I'm not sure it needs localization. Usually websites already detect the preferred language and show the appropriate content.

This sounds good to expect that fullReleaseNotesURL should probably not be localizable. I'm satisfied with that.