CosmicMutantExport Depricated need to change code

[adamjohnwright]

For the current version of COSMIC v98 they are deprecating the CosmicMutantExport file as described here: https://cog.sanger.ac.uk/cosmic-cms-production/documents/New_Download_files_Beta__Change_log.pdf

They are saying the same information can be created from two other files.

I am planning on using the files we downloaded for Reactome in the previous release of Reactome v87.

@jweiser I think this should be fixed for Reactome v88. I know you are already working on AddLinks. Should we assign this to you?