Refactored events to notifications on front-end, added prefutils to read

shared  preferences.

frontend/windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,9 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <encrypter/encrypter_plugin_c_api.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  EncrypterPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("EncrypterPluginCApi"));
 }

frontend/windows/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  encrypter
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST