Port Python 1D capabilities to C++

[ischoegl]

Abstract

The Python 1D Flame simulation objects implement several helper functions that make the Python API significantly more user friendly than other Cantera interfaces. The user-friendly implementation makes the Python code more complex than other interfaces, where both pure Python (onedim.py) and Cython (_ondim.pyx) implementations are used.

Motivation

Describe the need for the proposed change:

• What problem is it trying to solve? ... make 1D simulations more user friendly
• Who is affected by the change? ... users that don't use Python
• Why is this a good solution? ... single implementation is usable from all interfaces

Possible Solutions

Some modifications may impact only simple methods, while other simplifications may require refactoring of entire objects. A minimalist solution may just involve porting parts of FlameBase.set_initial_guess, while a maximalist solution implements FreeFlame, etc. in C++ via factory methods.