Allow choice between GitHub releases

This PR allows users to choose which asset to download in the event that there are multiple compiled assets available (as seen [here](https://github.com/rbray89/ActiveTextureManagement/releases)) asking them which to use when adding/updating instead of simply using the first.
If you don't need that filter anymore, you can just do
`LinkedHashSet<Element> assets = new LinkedHashSet<>(getLatestReleaseElement().select("...."));`