Android: add LaunchActivity as splashscreen

At first launch, the app is displaying the smartListFragment with an
empty list even if there is no account

This commit fix this behaviour by adding a splashscreen that check
permissions and load accounts at start
This commit is compatible android and AndroidTV.

Change-Id: I917c59cb66e0c09c145ddcc85ca19374f1ef640a
diff --git a/ring-android/app/src/main/res/layout/activity_wizard.xml b/ring-android/app/src/main/res/layout/activity_wizard.xml
index d82b543..21f93c2 100644
--- a/ring-android/app/src/main/res/layout/activity_wizard.xml
+++ b/ring-android/app/src/main/res/layout/activity_wizard.xml
@@ -1,8 +1,8 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/color_primary_dark">
+    android:background="@color/color_primary_dark"
+    android:orientation="vertical">
 
     <cx.ring.views.WizardViewPager
         android:id="@+id/pager"