This reverts commit 8fd2a615.

Continued with the user management; Removed some unnecessary parts of Shiro; Continued with the template

Added the JSF taglib for Spring Security; Removed the login-"logic" from the UserBean and moved it to the Spring Framework; Started with the usage of templates for the existing pages; Started with the page for the user management; Added more security patters; Added another user for test purposes

Updated the Kieker Jar; Views can be modified; Display property of the plugins is now used; Started with the view-submenu;

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

Added the files for JointJS; Made sure that the available plugins will be shown; Made sure that messages can be shown