Add search and watch history (#626)

Add search and watch history

* Make MainActicity a single task
* Remove some casting
* SearchFragment: start searching when created with query
* Handle settings change in onResume
* History: Log pop up and background playback
* History: Add swipe to remove functionallity
* Enable history by default
* Use stream item
* Store more information about the stream
* Integrate history database into AppDatabase
* Remove redundant casts
* Re-enable date converters
* History: Use Rx Java and run DB in background
 * Also make HistoryDAO extend BasicDAO
* History: RX-ify swipe to remove
* Sort history entries by creation date
* History: Set toolbar title
* Don't repeat history entries
  * Introduced setters so we can update entries in the database
  * If the latest entry has the same (main) values, just update it

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

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/selectableItemBackground"
+    android:clickable="true"
+    android:orientation="vertical"
+    android:paddingBottom="8dp"
+    android:paddingTop="8dp">
+
+    <TextView
+        android:id="@+id/time"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        tools:text="10/11/2017 11:32" />
+
+    <TextView
+        android:id="@+id/search"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textAppearance="?android:attr/textAppearanceMedium"
+        tools:text="Search query" />
+</LinearLayout>