Print error dialogs and warning toasts to the log

app/gui/CliStartStreamSegue.qml

@@ -26,6 +26,7 @@ Item {
     function onLaunchFailed(message) {
         errorDialog.text = message
         errorDialog.open()
+        console.error(message)
     }
 
     function onAppQuitRequired(appName) {

app/gui/QuitSegue.qml

@@ -18,6 +18,7 @@ Item {
         if (error !== undefined) {
             errorDialog.text = error
             errorDialog.open()
+            console.error(error)
         }
 
         // If we're supposed to launch another game after this, do so now

app/gui/StreamSegue.qml

@@ -45,6 +45,7 @@ Item {
     {
         // Display the error dialog after Session::exec() returns
         streamSegueErrorDialog.text = text
+        console.error(text)
     }
 
     function displayLaunchWarning(text)
@@ -56,6 +57,7 @@ Item {
         toast.text = text
         toast.timeout = 3000
         toast.visible = true
+        console.warn(text)
     }
 
     function quitStarting()