Removed Assessment mode from the Engine (code and xsd). Note: the enumerations belonging to this mode will be removed in next commit as this is part of two issues. Related to Issue [MWDAM-1410]
Implemented NOT the StabilityKernelType but added the kernel as FailureMechanismSystemType by adding WtiStabilityInside as mechanism. Removed StabilityKernelType as this is NOT to be used in the DamEngine. Related to Issue [MWDAM-1383]