Cleaned up and polished session flow

- Sessions can now be restarted if they error
- Terminology is much easier to follow in the plugin
- More change cases are handled correctly

plugin/src/init.server.lua

@@ -67,8 +67,11 @@ local function main()
 			end
 
 			Logging.info("Started new session.")
-			currentSession = Session.new()
+			currentSession = Session.new(function()
+				Logging.info("Session terminated.")
+				currentSession = nil
+			end)
 		end)
 end
 
-main()
+main()