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/templates/lesson_content.html

@@ -3,18 +3,11 @@
 
 
 <!-- Model is setup in the class StartLesson -->
-<div th:switch="${migrated}">
-    <div th:case="false" id="lessonInstructions" th:utext="${instructions}"></div>
-    <div th:case="true" id="lessonInstructions"></div>
-</div>
+<div id="lessonInstructions"></div>
 
 <div id="message" class="info" th:utext="${message}"></div>
 <br/>
 
-
-<div th:switch="${migrated}">
-    <div th:case="false" th:utext="${lesson.content}"></div>
-    <div th:case="true" th:replace="lesson:__${lesson.id}__"></div>
-</div>
+<div th:replace="lesson:__${lesson.id}__"></div>
 
 </html>