✨ Add successful launch count, sponsor alert

Okay, so this commit adds a sponsor alert. I wanted to elaborate.

Why? At this point I've invested so much of my free time in the app that
any and all donations would be incredibly welcome. Of course, phpmon
as it exists today must always remain free and open source.

(I dislike it when an app goes open source and then becomes paid.)

Obviously, I don't want to take useful features away from users:

1) usage of the old version is the only option for those who won't pay
2) piracy is an alternative and I don't want to deal with that
3) the positive sentiment around the app disappears ("sellout!")

Instead, I will nicely ask for donations once the app has been
successfully launched 7 times or more. This alert should only
appear once.

Fun fact: PHP Monitor started  as a single menu item with only
options to switch between version numbers.

Thanks to all the support, it has now become so much more.

To those who have already contributed: thank you very much.
I hope you continue to use and enjoy the app.

Cheers!

phpmon/Domain/Menu/MainMenu+Startup.swift

@@ -69,7 +69,9 @@ extension MainMenu {
         App.shared.loadGlobalHotkey()
         
         // Attempt to find out more info about Valet
-        Log.info("PHP Monitor has extracted the version number of Valet: \(Valet.shared.version)")
+        if Valet.shared.version != nil {
+            Log.info("PHP Monitor has extracted the version number of Valet: \(Valet.shared.version!)")
+        }
         
         Valet.shared.loadConfiguration()
         Valet.shared.validateVersion()
@@ -89,6 +91,9 @@ extension MainMenu {
                 repeats: true
             )
         }
+        
+        Stats.incrementSuccessfulLaunchCount()
+        Stats.evaluateSponsorMessageShouldBeDisplayed()
     }
     
     /**