[RM-8312] [multiobs][linemodel] Adapt AbstractFitter::fitAmplitude

Created on 2023-09-21 08:07:40 by Ali Allaoui. % Done: 100

Review CLineModelElement::m_OutsideLambdaRange and CLineModelElement::m_LineIsActiveOnSupport definition (maybe move them to CLineModelElementList) : CLineModelElement::prepareSupport

CLineModelElementList should be a vector of CLlineModelElement not shared_ptr<CLlineModelElement>