Fix issue when run game on desktop platforms

• check if native ads module exist for unityads and admob

Fix for yandex banner bug

Fix for yandex banner bug

Fix yandex open events and empty mediators

1. Added information about the opening of Yandex advertising.
2. Fixed work if the mediator is empty.

Fix wrong library folder in `game.project`

• Fix wrong library folder in game.project

Initial release without example and documentation

• The initial release of the universal ADS wrapper for Defold