Add support for global donation tokens on webform confirmation

We've had to implement support for global donation tokens on webform confirmations on multiple client builds. Additionally, we've also had to add order and transaction tokens to the donation token set. It would be nice if Fundraiser did this out of the box.

* Implementing hook_tokens_alter in fundraiser_webform to add global donation token support on a webform confirmation

* Implementing hook_tokens_alter in fundraiser_commerce to add support for the order and transaction tokens