Update Google Play Game Services to version 23.1.0

Dependencies were updated to the latest versions available at the moment:

play-services-base:18.3.0
play-services-auth:20.7.0
play-services-games:23.1.0

Add missing `gpgs.MSG_SAVE_SNAPSHOT` constant

• add missing gpgs.MSG_SAVE_SNAPSHOT constant

Updated to use new Lua json decoder

Works with Defold 1.4.0+

Remove `#` symbol from `game.project`

• game.project shouldn't contain # symbol if it's not an index of an array

Fix for Defold 1.2.190

• Use new dmAndroid::RegisterOnActivityResultListener API instead of dmExtension::RegisterAndroidOnActivityResultListener

Fix regression after previous commit

• Restore overwritten fix for #37

Smaller mutex scope + use new Defold SDK api

• Use smaller scope for the callbacks mutex to avoid possible ANRs/Crashes
• Use new Defold SDK API (1.2.188) for attaching VM thread and loading java class

Google Play Game Services 2.3.1

FIX: Crash when call gpgs.snapshot_commit_and_close() on armv7 Android phone.

Google Play Game Services 2.3.0

NEW: Improved error reporting back to the client. When an ApiExceptions is caught an error_status with additional information is also provided (from apiException.getStatusCode())

Google Play Game Services 2.2.0

NEW: New function to check if Google Play Game Services is available: gpgs.is_available()