moved copyValuesIntoSession and isContentEditable functions into the utility class. in editActivity, the state of the flags are added into the session,
testcases for testing addUser and addSession in noticeboardServicePOJO. TestToolContentManager are the new test cases for the updated code , same with ToolSessionManager
new method implementations for addUser and addSession, updated code to match the new implementations of ToolSessionManager and ToolContentManager. Accoutns for the ToolException and DataMissingException which may be thrown