Added property to dinamically get the GooglePlayGames root directory …

[mirkoaquaro]

…path

In the previous version of GPGSUtil.cs the GooglePlayGames directory path was hardcoded in all the fields requiring it, making it impossible to move the folder from "Assets" into a subfolder.

With this new version the issue is fixed and the GooglePlayGames directory can now be moved in any another project folder making it cleaner, tidier and less bloated.

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[mirkoaquaro]

I signed it!

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On 25 Feb 2018, at 15:01, googlebot ***@***.***> wrote: signed