v1.0.0

First initial release that provides the following:

1. Ability to add multiple top-level programs (C# 9.0 only feature) to an SDK-style project.
2. Populate Run dropdown with each C# file directly under the project root.
3. Other non-top-level program C# files can exist in subfolders in the project, for convenience.
4. Auto-open the startup file selected in the Run drop-down (the "launch profile") right after selection.

The last feature can be disabled by adding <OpenStartupFile>false</OpenStartupFile>.

Feature in action: