FindMy: Refactors and improvements

- state handled reparately, decoupled from app
- better apple/samsung/unknown parsing and handling
- improve error handling
- add url to manifest + up stack size just in case

applications/system/findmy/findmy.h

@@ -1,3 +1,5 @@
 #pragma once
 
 typedef struct FindMy FindMy;
+
+typedef enum FindMyType FindMyType;