LWJGL 3 - Android example project and tests

Build instructions for the Android version of lwjgl3:

• clone lwjgl3 and checkout the android branch.
• SET/export the ANDROID_SDK_HOME environment variable. Its value should be the root of the Android SDK. The Android NDK must also be installed under the root, in the default ndk-bundle subdirectory.
• Run ant compile-templates. This will take 1-2 minutes.
• Run ant aar. This will produce an lwjgl.aar file in the bin/android/ folder.
• Copy lwjgl.aar to the android-test repository, in the lwjgl folder.

Build instructions for the Android demos:

• Open the root in Android Studio.
• Wait for gradle synchronization and indexing to complete.
• Build the project.
• Connect a platform 24 compatible device, either via USB or Wi-Fi.
• Launch either the gears or hellovulkan run configurations. (shortcut: Alt+Shift+F10)

Installation of Vulkan validation layers:

• Create a JNI library folder for the target architecture. For example:
  • hellovulkan/src/main/jniLibs/arm64-v8a/ or
  • hellovulkan/src/main/jniLibs/armeabi-v7a/
• Copy the shared libraries from the corresponding folder in the Android NDK. For example:
  • <sdkroot>/ndk-bundle/sources/third_party/vulkan/src/build-android/jniLibs/arm64-v8a/ or
  • <sdkroot>/ndk-bundle/sources/third_party/vulkan/src/build-android/jniLibs/armeabi-v7a/
• Set the VALIDATE variable to true in HelloVulkan.java:53