Remove the Java Gherkin parser. Rely on Go binary/protobuf

[aslakhellesoy]

Summary

The Java Gherkin parser is gone!

Details

Parsing is delegated to a subprocess (gherkin-go executable)
The package has moved to io.cucumber.gherkin

Motivation and Context

Less code to maintain.

TODO

• Package prebuilt go binaries for various platforms
• Detect platform and extract the right binary
• Detect more platforms - see protoc-jar
• Download binary from S3 if not in jar
• Set up build process

[aslakhellesoy]

Currently, in order to build this, you have to:

cd gherkin/go
make cross-compile
cd ../java
mkdir gherkin-go && cp ../go/dist/*

We can automate that for the monorepo build, but for the subrepo build, ../go is not available. I think the best is to download the binaries from GitHub in that case. The publish-release target in gherkin/go can do the upload.

[mlvandijk]

fyi, make cross-compile gave me an error; command 'gox' not recognized (or something similar).
Adding the following to my .bash_profile fixed it:

Add go bin to path

export PATH=$(go env GOPATH)/bin:${PATH}

[mlvandijk]

Also cp ../go/dist/* ./gherkin-go to copy the files to the created dir

[aslakhellesoy]

You shouldn't have to do that @mlvandijk - MagicFile will download from S3.

[lock]

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