Check for compatible updates in plugin

[boatbomber]

Adds a setting to checking for updates.

When a newer compatible version is detected, it gives the user a notification. It will not notify about major version updates, since those are potentially breaking and the user may have reason to remain on the older version.

When the setting is enabled in a local install (ie: not the marketplace published plugin), it also adds a setting for being notified about prereleases (defaults to off).

This should hopefully reduce the number of reports we get from people simply using outdated versions.

[Dekkonot]

I'm of two minds here.

The first loves this because it'd serve as a reminder for people to actually update their dang Rojo releases.

The second thinks this'll be annoying and that prompting people for pre-releases might be a problem since we don't plan to publish the plugin to the website for those versions. I appreciate how you can turn it off but I'm not sure how much I like a feature that my first thought was "I hope you can turn it off" for.

[boatbomber]

You're correct in that prereleases are likely to cause more confusion for marketplace users... Should I disable that subsetting when installed via marketplace? I can detect that pretty easily.

[boatbomber]

If you install Rojo via marketplace, the Include Prerelease setting is hidden to avoid confusion.

[Dekkonot]

I've reconsidered this and I think we should include it, haha.