LDEV-1978: Filter access to Learning Flash sequence, in addition to securing single Activity access. This prevents unnecessary ToolSessions from being created.Also, find exact user's ToolSession when accessing Monitor, rather than iterating through them.
LDEV-1978: Check for Lesson's allowed users rather than ToolSession's ones, because an unathorised access to some Tool's Learner creates a separate ToolSession for that singe user (so he is an allowed person).
LDEV-2711: Forbid accessing lesson level gradebook by learners.Allow setting courseName without prefix.Fix a bug when accessing course level gradebook by learners.
LDEV-2711: Add "mode=gradebook" parameter value to LoginRequestServlet so it redirects user straight to Gradebook servlet after authentication.Modify parameters veryfied by Gradebook servlet on access to keep them coherent with LoginRequestServlet.
CNG-1: Add basic MinApp integration implementation to public CVS.Temporarily override security for several servlets until OpenID support is introduced.Allow hiding chosen buttons in Planner using URL parameter.Allow overriding Back button target in Planner using URL parameter.