Integrate eclipse-commons library via maven dependency

[de-jcup]

Situation

Currently eclipse-commons library (https://github.com/de-jcup/eclipse-commons) is directly added into lib folder inside Git repository. Having a binary/library inside a GIT repo is normally a very bad idea. (

Wanted

No binary version of eclipse-commons inside GIT any longer

Solution

When #371 has been done and de-jcup/eclipse-commons#30 as well, the dependency management shall reference the eclipse-commons library via maven central and the binary from lib folder shall be removed

[vogella]

I think we have done this

[de-jcup]

Remark: We have done this for the maven - build (#371) . There are still some changes necessary to have the maven build full working, but we have done most parts now and it is okay to close this issue.