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Display `H256` instances in events as hex encoded string

Sergej Kostjucenko requested to merge aj/fix-display-code-hash into master

Created by: ascjones

Following #547, instances of H256 in events are displayed as raw byte arrays. Like so (see Code::Stored::code_hash):

image.

This PR introduces a customer decoder for H256 instances which displays it as a hex encoded string instead:

image

In doing this I have split the custom type transcoders into separate encoders and decoders so that a type can have only one or both.

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