Drop binary distribution

**Describe the refactoring action**
No longer prepare a binary distribution.

**Expected benefit**
* The UIMA JARs are likely to be mostly consumed via Maven Central these days.
* For the installation of the Eclipse Plugins, we have our update site
* Documentation is available on our website
* We need to check and update the license and notice files of all the third-party JARs we include in the binary distribution. This takes a lot of time. Having no binary distribution removes this to some degree (we still have the problem with third-party JARs embedded in the Eclipse plugin JARs - but maybe we can do without embedded JARs in the future and pull things in via OSGi at runtime).
* The build includes various quirks in particular in the UIMAJ root POM to handle the binary distribution in the way it is currently built. These can be removed.

**Drawbacks**
* A good part of the installation instructions of our documentation gets outdated then and needs to be updated or removed.
* In particular the descriptions of the examples assume a binary distribution. We need to switch things to the source distribution.
* Scripts and apps such as *cpeGui.sh* or *runV3migrateJCas.sh* are not longer conveniently accessible. That said, I doubt there are (m)any people using those.

Start with the UIMAJ root POM and inventory how the binary distribution is prepared, then review installation instructions and example descriptions that assume it exists. Check the cpeGui.sh and runV3migrateJCas.sh references as well; done means the binary distribution is removed and affected documentation is updated or removed.

Written by the indexing model from the issue text.