Enable sharing media directly from Tusky (#852)

* Extract duplicated code into BaseActivity

* Migrate MediaUtils to kotlin

* Migrate ViewVideoActivity to kotlin

* Migrate ViewMediaActivity to kotlin

* Initial media sharing functionality

* Address code review feedback

* Make share icon match

* Address code review feedback

app/src/main/res/drawable/ic_menu_share_24dp.xml

@@ -0,0 +1,25 @@
+<!--
+Copyright (C) 2014 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0"
+        >
+    <path
+        android:pathData="M18,16.1c-0.8,0 -1.5,0.3 -2,0.8l-7.1,-4.2C9,12.5 9,12.2 9,12s0,-0.5 -0.1,-0.7L16,7.2C16.5,7.7 17.200001,8 18,8c1.7,0 3,-1.3 3,-3s-1.3,-3 -3,-3s-3,1.3 -3,3c0,0.2 0,0.5 0.1,0.7L8,9.8C7.5,9.3 6.8,9 6,9c-1.7,0 -2.9,1.2 -2.9,2.9s1.3,3 3,3c0.8,0 1.5,-0.3 2,-0.8l7.1,4.2c-0.1,0.3 -0.1,0.5 -0.1,0.7c0,1.6 1.3,2.9 2.9,2.9s2.9,-1.3 2.9,-2.9S19.6,16.1 18,16.1z"
+        android:fillColor="#FFF"/>
+</vector>