Base codec functionality

[codemerx]

This is the delta-codec-java as described at https://github.com/ably/wiki/issues/380#issuecomment-533647591

[QuintinWillison]

Given the lack of activity on this PR and the underlying branch, @codemerx , could you please consider merging it to master and then rebase #3 to target master (once you've confirmed we can get rid of #2)?

[codemerx]

Given the lack of activity on this PR and the underlying branch, @codemerx , could you please consider merging it to master and then rebase #3 to target master (once you've confirmed we can get rid of #2)?

Argh I forgot to add @paddybyers as a reviewer when I created this. I'd gladly merge it but @QuintinWillison and @paddybyers could you review it beforehand?

[QuintinWillison]

I'm confused as to the purpose of this repository.

All I was expecting to see exported, for consumption by our client library, was a single stateless function (i.e. static method) taking two byte arrays and returning one byte array.

The thing is, that's surely what com.davidehrmann.vcdiff.VCDiffDecoder does already?

So, is this repository just for those not using ably-java (i.e. SSE / MQTT)?

[paddybyers]

Closing this PR - incorporated into #3