Android examples: basic structure for an android example app module

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This PR modifies the following:

• The project root structure to include 4 modules.
• Helper-scripts to include android-debug scripts/

This PR adds the following:

• jme3-alloc-android-example application module that implements both the jme3-alloc and jme3-alloc-examples jar outputs.

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Notice, this is a minimal android port, there should be more work on this android application to implement a test chooser for example.

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To test locally use this command:

└──╼ $./gradlew clean && 
      ./gradlew :jme3-alloc:compileJava &&
      ./gradlew :jme3-alloc-native:compileAndroid && 
      ./gradlew :jme3-alloc-native:copyNatives && 
      ./gradlew :jme3-alloc:android :jme3-alloc:assemble && 
      ./gradlew :jme3-alloc-examples:copyLibs && 
      ./gradlew :jme3-alloc-examples:createJar && 
      ./gradlew :jme3-alloc-android-example:clean &&
      ./gradlew :jme3-alloc-android-example:build &&
      ./gradlew :jme3-alloc-android-example:assemble && 
      ./gradlew :jme3-alloc-android-example:installDebug

And to run, use:

$ adb shell am start -n "com.jme3.alloc.android.example/com.jme3.alloc.android.example.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER && adb logcat

Or just launch the application from the app drawer gui.