[Android] Define file to back up

Google allows for a max of 25MB so leave out all the MPQ files

android-project/app/src/main/AndroidManifest.xml

@@ -39,6 +39,7 @@
     <application android:label="@string/app_name"
         android:icon="@mipmap/ic_launcher"
         android:allowBackup="true"
+        android:fullBackupContent="@xml/backup_descriptor"
         android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
         android:hardwareAccelerated="true">
 

android-project/app/src/main/res/xml/backup_descriptor.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content>
+    <include domain="external" path="." />
+    <exclude domain="external" path="devilutionx.mpq" />
+    <exclude domain="external" path="diabdat.mpq" />
+    <exclude domain="external" path="DIABDAT.MPQ" />
+    <exclude domain="external" path="fonts.mpq" />
+    <exclude domain="external" path="hellfire.mpq" />
+    <exclude domain="external" path="hfmonk.mpq" />
+    <exclude domain="external" path="hfmusic.mpq" />
+    <exclude domain="external" path="hfvoice.mpq" />
+    <exclude domain="external" path="patch_rt.mpq" />
+    <exclude domain="external" path="patch_sh.mpq" />
+    <exclude domain="external" path="pl.mpq" />
+    <exclude domain="external" path="ru.mpq" />
+    <exclude domain="external" path="spawn.mpq" />
+</full-backup-content>