This patch modularizes the code responsible for selecting the stopping power coefficients. Specifically, it:
- moves the data in `elemPars` to seperate JSON files in the `data/` directory. This makes it easier to modify the existing data or add new data sources. Note that this refactoring does not alter the previous functionality - the contents of each file are simply read and deep-merged into an initially empty `elemPars` object.
- adds the original Varelas-Biersack parameters from Anderson & Ziegler (1977).
- updates the "Other Parameters" tab in the GUI for easy toggling between the different stopping power coefficient data sources.
ext-mcfadd_r
391c25ef93