Fix several lints and warnings

android/AndroidManifest.xml

@@ -1,16 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="dev.lonami.klooni"
-    android:versionCode="1"
-    android:versionName="1.0" >
-
-    <uses-sdk android:targetSdkVersion="25" />
+    xmlns:tools="http://schemas.android.com/tools"
+    package="dev.lonami.klooni">
 
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
-        android:theme="@style/GdxTheme" >
+        android:theme="@style/GdxTheme"
+        android:fullBackupContent="@xml/backup_rules"
+        tools:ignore="GoogleAppIndexingWarning">
         <activity
             android:name="dev.lonami.klooni.AndroidLauncher"
             android:label="@string/app_name" 

android/build.gradle

@@ -1,6 +1,6 @@
 android {
     buildToolsVersion "25.0.3"
-    compileSdkVersion 25
+    compileSdkVersion 28
     sourceSets {
         main {
             manifest.srcFile 'AndroidManifest.xml'
@@ -19,6 +19,7 @@ android {
     }
     defaultConfig {
         applicationId "dev.lonami.klooni"
+        //noinspection MinSdkTooLow
         minSdkVersion 8
         targetSdkVersion 28
 

android/res/xml/backup_rules.xml

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content>
+</full-backup-content>

android/src/dev/lonami/klooni/AndroidLauncher.java

@@ -1,6 +1,6 @@
 /*
     1010! Klooni, a free customizable puzzle game for Android and Desktop
-    Copyright (C) 2017  Lonami Exo | LonamiWebs
+    Copyright (C) 2017-2019  Lonami Exo @ lonami.dev
 
     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

android/src/dev/lonami/klooni/AndroidShareChallenge.java

@@ -1,6 +1,6 @@
 /*
     1010! Klooni, a free customizable puzzle game for Android and Desktop
-    Copyright (C) 2017  Lonami Exo | LonamiWebs
+    Copyright (C) 2017-2019  Lonami Exo @ lonami.dev
 
     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