android: Define a new color scheme

This mainly changes the color of the appbar (colorPrimary), the color
of the status bar (colorPrimaryDark) is black like the default.
The accent color (colorAccent) used for controls like buttons and check
boxes is a slightly toned down version of the default.

src/frontends/android/app/src/main/res/values/colors.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-    Copyright (C) 2012-2013 Tobias Brunner
-    Hochschule fuer Technik Rapperswil
+    Copyright (C) 2012-2016 Tobias Brunner
+    HSR Hochschule fuer Technik Rapperswil
 
     This program is free software; you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by the
@@ -15,6 +15,15 @@
 -->
 <resources>
 
+    <color
+        name="accent">#96BDC2</color>
+
+    <color
+        name="primary">#A2042C</color>
+
+    <color
+        name="primary_dark">#000000</color>
+
     <color
         name="error_text">#D9192C</color>
 
@@ -25,7 +34,7 @@
         name="success_text">#99CC00</color>
 
     <color
-        name="panel_background">#333333</color>
+        name="panel_background">#444444</color>
 
     <color
         name="panel_separator">#5a5a5a</color>

src/frontends/android/app/src/main/res/values/styles.xml

@@ -16,10 +16,14 @@
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
 
     <style name="ApplicationTheme.Base" parent="Theme.AppCompat">
+        <item name="colorAccent">@color/accent</item>
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryDark">@color/primary_dark</item>
         <item name="android:alertDialogTheme">@style/AlertDialogTheme</item>
     </style>
 
     <style name="AlertDialogTheme.Base" parent="Theme.AppCompat.Dialog.Alert">
+        <item name="colorAccent">@color/accent</item>
     </style>
 
 </resources>