BUGS:
    - resize -> Hud issues

TODO:
    - Animations
        - selected Hex
        - infantry move sound
        - infantry shot
    - tutorial
        - moves
        - HQ moves
        - objectives
        - engagement
    - correctly dispose of everything at the end of a game
    - pause / resume
    - maybe do not need cancel button in engagement and HQ mode, but must support canCancel option

NEXT:
    - support different board layout
        - north orientation
        - hex orientation
        - inverted even/odd row scheme
    - automatic overlays to show unit stack depth

device unique ID:
    final TelephonyManager tm = (TelephonyManager) getBaseContext().getSystemService(Context.TELEPHONY_SERVICE);

    final String tmDevice, tmSerial, androidId;
    tmDevice = "" + tm.getDeviceId();
    tmSerial = "" + tm.getSimSerialNumber();
    androidId = "" + android.provider.Settings.Secure.getString(getContentResolver(), android.provider.Settings.Secure.ANDROID_ID);

    UUID deviceUuid = new UUID(androidId.hashCode(), ((long)tmDevice.hashCode() << 32) | tmSerial.hashCode());
    String deviceId = deviceUuid.toString();

better to track installation:
    http://android-developers.blogspot.ch/2011/03/identifying-app-installations.html


integrate native android stuff in libgdx:
    https://code.google.com/p/libgdx-users/wiki/IntegratingAndroidNativeUiElements


crypt:
    https://code.google.com/p/gwt-crypto/


font:
    http://kvazars.com/littera/