- Introduced user registration

- Now using Spring Boot for classloading, this way local development does not need to restart the complete server
- Fixed all kinds of dependencies on the names of the lessons necessary to keep in mind during the creation of a lesson.
- Simplied loading of resources, by adding resource mappings in MvcConfig.
- Refactored plugin loading, now only one class is left for loading the lessons.

webgoat-container/src/main/java/org/owasp/webgoat/controller/Welcome.java

@@ -55,7 +55,7 @@ public class Welcome {
      * @param request a {@link javax.servlet.http.HttpServletRequest} object.
      * @return a {@link org.springframework.web.servlet.ModelAndView} object.
      */
-    @RequestMapping(path = "welcome.mvc", method = RequestMethod.GET)
+    @RequestMapping(path = {"welcome.mvc", "/"}, method = RequestMethod.GET)
     public ModelAndView welcome(HttpServletRequest request) {
 
         // set the welcome attribute