Create a shared project with all Win App common files (8.1 and 10)

Finally use the dependency injected Resource Service

ModernKeePass.Infrastructure/DependencyInjection.cs

@@ -28,6 +28,7 @@ namespace ModernKeePass.Infrastructure
             services.AddScoped(typeof(IFileProxy), typeof(StorageFileClient));
             services.AddTransient(typeof(ISettingsProxy), typeof(UwpSettingsClient));
             services.AddTransient(typeof(IRecentProxy), typeof(UwpRecentFilesClient));
+            services.AddTransient(typeof(IResourceProxy), typeof(UwpResourceClient));
             return services;
         }
     }