Commenting out some junk to make it build.
Moving DI stuff into Entry Point. Trimming MudApplication.
Rename MudApplication.Main to Start.
MudApplication.Start no longer runs a server.
+Stub for first MudApplication unit test.
+ISubsystem interface.
+ISubsystemLoader.
+Test for starting subsystems.
Test now verifies that Logging subsystem is started.
MudApp now starts client subsystem. +Test