Implement popup mode

- Add icons replay, fast_forward
- Add strings
- Add menu entry
- Add as option to open link directly to popup mode

app/src/main/res/drawable/popup_controls_bg.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <gradient
+        android:startColor="#a0000000"
+        android:centerColor="#26000000"
+        android:endColor="#00000000"
+        android:angle="90"
+        />
+</shape>