Add in lib for admin giveaways

[wroersma]

This should allow the twitch streamer to give away products on their stream to their selected group of viewers

• [x] Select Product to give away
• [x] Record giveaway winners
• [x] Record Products given away to winners

[wroersma]

The basic function to select a random winner from a sub user list is working. It needs to be made more modular and into a plugin format. This requires other backend work