Moving forward cleaning up some unnecessary lesson super classes which we

do not need to support anymore in 8.0:

- Introduced DI thoughout the code base
- Removed most superclasses of a lesson
- Hammerhead is now simplified to only one line of code
- Cleaned up WebSession
- Removed code which dealt with user roles, lesson fetching, username etc
- LessonTracker improvements
- Removed almost all code from the Screen class
- Removed ECS from the container project
- Removed adminstration pages, contained a lot of ECS codes which is much
  simpler to just rewrite when necessary

webgoat-container/src/main/resources/application.properties

@@ -1,4 +1,5 @@
 server.error.include-stacktrace=always
+server.error.path=/error.html
 server.session.timeout=600
 server.contextPath=/WebGoat
 server.port=8080
@@ -15,7 +16,7 @@ security.enable-csrf=false
 spring.devtools.restart.enabled=true
 
 
-
+webgoat.user.directory=${user.home}/.webgoat/
 webgoat.build.version=@project.version@
 webgoat.build.number=@build.number@
 webgoat.email=webgoat@owasp.org