Retrieve accounts on reload (#29)

* Display HD path on sign message page

* Create component for displaying account details

* Add retrieve accounts function

* Load accounts after closing app

* Fix the retrieve accounts function

* Use hdpath instead of id

* Check if keystore is empty while retrieving accounts

* Add spinner when accounts are being fetched

* Display complete hd paths after reloading the app

* Remove any return type

* Store public key and address

* Modify sign message function to use path

* Fix the add accounts functionality

styles/stylesheet.js

@@ -101,6 +101,11 @@ const styles = StyleSheet.create({
     marginTop: 20,
     width: 200,
     alignSelf: 'center',
+    spinnerContainer: {
+      flex: 1,
+      justifyContent: 'center',
+      alignItems: 'center',
+    },
   },
 });