[Dev] CPIA refactoring: eliminating blockName?

[John Anderson]

itsName gets turned into something useless when a block gets copied to 
the soup, BlockName doesn't, so we should always be using BlockName.

Alec Flett wrote:

> Working on the ZaoBao tutorial, and trying to explain the difference 
> between a Block's blockName and its itsName, I'm starting to wonder: 
> why do we have both?
>
> I came up with two reasons:
> - easy referencing/lookup of blocks by name.
>   But schema.ns() provides easy access to any well-known object by name.
> - event dispatching - to dispatch to an event with a given name.
>   But again, schema.ns provides easy access.. and besides I think in 
> many cases I think we'd be better off just using 
> SendToBlockByReference and just directly referencing the block.
>
> Thoughts? I can see how blockName was useful at one point, but I think 
> now its purpose has been superceded by schema.ns().
>
> Alec
>
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