Updated the kieker-jar and some other dependencies; Added the user-properties; Some code-modifications for quality reasons; Refactoring

Added Apache Shiro for test purposes; Replaced toString-IDs with Registry-IDs; Added the connections for presentation purposes to the analysis editor again;

Started with an improved version of the GUI, including a multi user mode; Updated also the Kieker-jar.

Modified the project: It can now be compiled and deployed via Maven; Also it is using jetty now. The Read.me-file contains instructions how to start the project.