Coding - Refactor switch-case statements and improve memory management #569

- Added missing break statements in switch-case blocks in LDOMBasicString, LDOM_BasicElement, PCDM_ReadWriter, and IntCurve_IntConicConic_1 to prevent fall-through behavior.
- Enhanced Standard_Macro.hxx to support fallthrough attributes across different compilers.
- Corrected the use of std::forward in Standard_MemoryUtils.hxx for better type deduction.
- Replaced raw arrays with NCollection_Array1 in AdvApp2Var_SysBase for improved memory safety.
- Updated Extrema_ExtCC2d to utilize smart pointers for better memory management and avoid potential leaks.
- Refactored Units_UnitsDictionary to use NCollection_Array2 for matrix representation, improving readability and maintainability.
- Initialized TranFirst and TranLast in TopTrans_CurveTransition constructor for better default state management.
- Set myStatus in ShapeConstruct_ProjectCurveOnSurface constructor to ensure proper initialization.
- Changed matrix access in Units_UnitsDictionary to use NCollection_Array2 syntax for consistency.

src/ModelingAlgorithms/TKGeomAlgo/IntCurve/IntCurve_IntConicConic_1.cxx

@@ -2068,6 +2068,7 @@ void IntCurve_IntConicConic::Perform(const gp_Lin2d&        L1,
                 ParamEnd2 = ParamEnd - Org2SurL1;
               }
             }
+            break;
           default: //~~~ Segment Infini a droite
             break;
         }