Add option to skip C++ metrics calculations for lambdas and nested classes

[barnabasdomozi]

• Changed CppRecord parsing: we now also store an isLambda and context attribute
• Changed CppServiceHandler::getProperties to display the new attributes
• Added CLI options --cppmetrics-ignore-lambdas and --cppmetrics-ignore-nested-classes to skip C++ metrics calculations in those cases
• These new CLI options are considered when calculating: lackOfCohesion, efferentTypeLevel, afferentTypeLevel