druide

Implemented serde::de::Visitor::visit_i128. This fixes compatability with Ipld::Integer when using DagJsonCodec.

## Problem When you first get acquainted with the library, it is difficult to get that you need to write your own CapabilitySemantics. I propose to make some default and...

* added "ucan" scheme support (spec v0.10.0, except "ucan:\/\/\\/\") * serialize/deserialize Capabilities as a Map (as specified in the spec, was a List) * removed "my", "as", "prf" schemes (are...