Expand images on tap (#315)

* Detect click on images in WebView

* First stub of the fragment to show the image in full screen

* Scale image dimension to fit the display

* Hide toolbar from Image view

* Add back button to the Image view

* Open one image on tap

* Allow zooming on images

* Revert to using Toolbar for navigation.

* Remove vibration when opening the Image view

* Do not open links associated with images

* Send all images in the webpage to the Image fragment.

* Change image on swipe

* Store article images in cache in background.

* Use PhotoView in place of WebView to display images. Implemented a pager to swipe through images.

* Removed debugging logging.

app/src/main/res/layout/activity_image.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appBarLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolBar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            app:popupTheme="?attr/toolbarPopupTheme"
+            app:theme="@style/ToolBarStyle" />
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.viewpager.widget.ViewPager
+        android:id="@+id/pager"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/appBarLayout" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_image.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.github.chrisbanes.photoview.PhotoView
+        android:id="@+id/photoView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_centerVertical="true"
+        android:layout_centerHorizontal="true"
+        android:background="@android:color/black"
+        app:srcCompat="@android:drawable/screen_background_dark" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>