Add Donation Badges to user avatars

[BoweFrankema]

Allow an admin to set donation badges for different donation types and show those badges on top of the user his avatar.

Implementation

The BuddyVerfied (https://github.com/CFCommunity-net/BuddyVerified) plugin has a solid system in place to add the badges to members. We could replicate this functionality mostly to filter the avatars.

Assigning Badges

I think it would make sense to add an small upload field extending the CMB2 framework Give uses and adding it to the Donation Type fields.

[henrywright]

This feature is now in place; some outstanding tasks:

1. Front-end and admin area CSS
2. Give admins the option to display badges on a) single member page only and b) everywhere including member and activity loops
3. Cache total donation amount

Possibly
4. Request Give provide a get_customer() method
5. Anything else?