Organize app package

app/app-browser.go

@@ -28,9 +28,6 @@ type Application struct {
 	cbid           js.Value
 }
 
-// Application singleton
-var app *Application
-
 // App returns the Application singleton, creating it the first time.
 func App() *Application {
 

app/app-desktop.go

@@ -32,9 +32,6 @@ type Application struct {
 	frameDelta     time.Duration      // Duration of last frame
 }
 
-// Application singleton
-var app *Application
-
 // App returns the Application singleton, creating it the first time.
 func App() *Application {
 

app/app.go

@@ -5,6 +5,9 @@
 // Package app implements a cross-platform G3N app.
 package app
 
+// Application singleton
+var app *Application
+
 // OnExit is the event generated by Application when the user
 // tries to close the window (desktop) or the Exit() method is called.
 const OnExit = "app.OnExit"