Create a small code to generate unique identicons for holochain entry IDs

[adaburrows]

@Kasimirsuterwinter wrote:

Create a simple way of compressing the 39 bytes Base64 string into a visual pattern that's easier to recognize as unique.

Have distinct levels of depth for users that require more certainty.

level 1: unique visual representation level 2: first 4 and last 4 characters of the string level 3: the full string

Renderings for entry IDs and for agent IDs