Start button functionality (#21)

* srvPublishToSubscriber

Pressing Start from the app now sends the user to the Power Off screen.

* *hax check

As per Sono, checks whether the current environment is *hax. If it isn't, it goes to the home screen; otherwise, it restarts the console.

* Bugfixes

This may work?

* Revert "Bugfixes"

This reverts commit 7c382d719a.

source/main.c

@@ -86,10 +86,17 @@ int main(void)
         
         if (kDown & KEY_START)
         {
-            exit_screens();
-            exit_services();
-            PTMSYSM_RebootAsync(0);
-            ptmSysmExit();
+            if(!envIsHomebrew()) 
+            {
+                srvPublishToSubscriber(0x202, 0);
+            } 
+            else 
+            {
+                exit_screens();
+                exit_services();
+                PTMSYSM_RebootAsync(0);
+                ptmSysmExit();
+            }
         }
         else if (kDown & KEY_L)
         {