Hipparchus 2.0

• addition of a sequential Gauss-Newton optimizer
• improved relative scheduling of step handlers and events handlers in ODE addition of a finish callback in step handlers
• replacement of RealFieldElement by CalculusFieldElement interface
• many improvements in Complex to fully implement CalculusFieldElement with correct branch cuts
• addition of FieldComplex
• addition of complex and field complex univariate integrals (including contour integrals)
• addition of field versions of univariate integrators
• implementation of elliptic functions and integrals (for real, complex and general fields)
• faster simultaneous computation of sinh/cosh
• addition of the Ryū algorithm to generate very fast the shortest decimal representation of a floating point number that maintains round-trip safety.