Trivial Drive IAB Demo Game

9/2/2020

Adds a second consumable item able to be purchased.
The second consumable item gives the ability to make a small donation.
This is an example of having a second consumable purchase item.
The new donation item is similar in concept to buying petrol, but it does not involve the concept of empty / full.
It requires that when a consumable item is successfully purchased, we need to work out whether it was gas or a donation, and respond to the user accordingly.