syre src

- syreDrive: improved Simulink model
- syreDrive: added PLECS export
- Documentation: added ICEM 2022 tutorial and PLECS conference 2022 presentation
Minor updates:
- Matlab compatibility: improved compatibility with Matlab 2019b (added .m files to run in place of .mlapp files)
- GUI_Syre_MMM: minor bug fixed in resistance computation for different temperatures/frequencies
- GUI_Syre_MMM: improvement of skewed maps computation
- minor bug fixed for SPM geometry
- minor bug fixed for IM geometry
- minor bug fixed for multi-3-phase motor simulation
- improvement of skewing