ABI files are distributed separately now

[oberstet]

The ABI files are no longer part of this repo

• https://github.com/crossbario/xbr-protocol/tree/master/abi

but released and distributed separate.

The complete set of ABI files can be downloaded in a ZIP archive from:

• https://xbr.network/lib/abi/xbr-protocol-20.3.1.zip

whereas the individual contract ABI files are available here:

• https://xbr.network/lib/abi/xbr-protocol-20.3.1/XBRNetwork.json

The ABI files are built and deployed automatically in our CI, uploaded to S3 and the respective cloudfront distribution is invalidated:

• https://travis-ci.org/crossbario/xbr-protocol/jobs/657303717#L1270

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We should add respective docs, and also update the project README

[oberstet]

the zipped ABI files are convenient to use for automated dependent projects, while the individual ABI file access can be convenient for developer UIs.

eg firefox renders abi files like standard json files (which they are of course):