Not all dependencies required to build jsweet are available on Maven Central

[kohlschuetter]

Unfortunately, at this point not all required components are available on Maven Central.

Currently, components required to build jsweet, such as org.cincheo:file-visitor:1.0.0 and org.jsweet.ext:typescript.java-ts.core:2.0.4, as well as all org.jsweet.candies:*.* are only available at http://repository.jsweet.org.

That's a roadblock for any continued development of jsweet by third parties, as they are at the mercy of the availability of that custom repository.

jsweet should at least publish all artifacts required to build jsweet (which include some candies for unit testing) to Maven Central.

Related to #565