Major look'n'feel update. Icons and buttons added to the drawer. Code cleanup.

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

@@ -0,0 +1,8 @@
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <gradient
+        android:angle="270"
+        android:endColor="#181818"
+        android:startColor="@color/surfaceDark"
+        android:type="linear" />
+</shape>