New home layout with public timelines (#288)

* add dummy popup menu
* add pager to home fragment
* reduce pager sensitivity
* remove timelines from discover fragment
* add fabs to timelines
* change info banner color
* add back toolbar functionality
* update icons on navigate
* handle back press
* add lists and hashtags
* use tabs
* improve timeline title
* tweak switcher behavior
* fix show new posts button appearance
* hide show new posts button on reload
* tweak show new posts animations
* work around crash theme switch
* enable disabling federated timeline

mastodon/src/main/res/layout/discover_info_banner.xml

@@ -8,7 +8,7 @@
 	android:layout_gravity="top"
 	android:elevation="1dp"
 	android:outlineProvider="background"
-	android:background="?colorWindowBackground">
+	android:background="?colorBackgroundLight">
 
 	<TextView
 		android:id="@+id/banner_text"