[FMI] Generate a standard SSP file instead of a JSON file when exporting task architectures
As of now, the FMU export functionality encodes the task architecture in a JSON file which can directly serve as input for our co-simulation software. To improve the AF3's interoperability, this format shall be replaced by the well-established XML-based System Structure and Parameterization (SSP) standard. By this, the output of the FMI export function can be fed directly into state-of-the-art open-source co-simulation tools such as OpenModelica as well as industry-leading software by dSPACE and Dassault Systèmes (see here).