Move most installation functionality to InstallService. This makes it easier to have multiple drop areas while keeping them in sync.

res/app/components/stf/screen/screen-controller.js

@@ -1,4 +1,13 @@
-module.exports = function DeviceScreenCtrl($scope, $rootScope, ScalingService) {
+module.exports = function DeviceScreenCtrl(
+  $scope
+, $rootScope
+, ScalingService
+, InstallService
+) {
   $scope.displayError = false
   $scope.ScalingService = ScalingService
+
+  $scope.installFile = function ($files) {
+    return InstallService.installFile($scope.control, $files)
+  }
 }