2.0 final breaking changes: Final call (until 3.x)

[Deadpikle]

Things are ready to go for 2.0. All I have to do is deprecate the old things (see #61) and create the newer, final NetSparkleUpdater.Core feed.

This is the last call for any breaking changes before 2.0's release. Any renames, API changes, etc. need to happen ASAP before 2.0 happens. Please list any suggestions here in this thread.

If I hear nothing within a bit of time (week minimum, max 4 weeks or so), I will assume the 2.0 API (names, etc.) is good to go and can be pushed live.

2.0 will probably be the last version that supports .NET Framework. This is undecided, of course. Maybe 2.0 will be the last .NET 4.5 version, and a breaking change will be bumping up to .NET 4.8 or something.