[MASTER] JBIDE-18731 - remove use case of cmd-line project archives / weird packaging of plugin 

remove deprecated usecases and classes
this doesn't belong here. If we don't have a generic concatenation method available in foundation already, then either use [StringUtils.join from commons-lang](https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/StringUtils.html#join(java.lang.Object[])) or [Joiner from guava](http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Joiner.html)