1.12.0 Release

Android OneSignal Native SDK 2.0 and Misc fixes

• Updated Android native OneSignal to version 2.0.1 from 1.10.7
  • See [these release notes](https://github.com/one-signal/OneSignal-Android-SDK/releases#2.0.1 Release) for more details
• Moved most SDK files into a OneSignal folder for Unity 5 for a cleaner import.
  • 4.6 SDK package exists for backwards compatibility.
• Updated to latest version of Google Play services and Android Support library v4 with AAR files.
  • This fixes compatibility when also using the Google Play Games for Unity plugin in a project.
• Fixed Log link error when using some other Unity plugins.