WIP: Add TOML files, converted from parameter txt files

[N-Dekker]

TOML's concept of a table of key-value pairs appears to match the elastix concept of a map of parameters. Just like elastix, TOML requires each key (parameter name) to be unique: https://github.com/toml-lang/toml/blob/1.0.0/toml.md#keys TOML also supports arrays of mixed types.

Like YAML, TOML supports comments, starting with #: https://github.com/toml-lang/toml/blob/1.0.0/toml.md#user-content-comment

TOML has built-in Python support, from Python 3.11: https://docs.python.org/3/library/tomllib.html For example:

import tomllib

file_path = "path/to/ElastixModelZoo/models/Par0001/Par0001bspline04.toml"
with open(file_path, "rb") as file_object:
    parameter_dict = tomllib.load(file_object)

The Python dict returned by tomllib.load is quite similar to an elastix ParameterMap, although we might need to write some extra code to ease conversions between such a dict and a ParameterMap.

There are various open source TOML parsers available in C++.

TOML was suggested by both Matt McCormick (@thewtex) and Denis (@dpshamonin)

@mstaring @stefanklein Please have a look! Specifically look at the second commit, "WIP: Convert all *.toml files to the TOML file format

@lassoan Andras, would TOML file support also be useful to you?

• Aims to supersede pull request WIP: Add YAML files, converted from parameter txt files #14

[dpshamonin]

👍