Make editing of ICD Codes that make up each CCC easier

[magic-lantern]

Right now the ICD codes for each CCC are hard coded into the file pccc.cpp

For ease of maintenance, pull the codes out into some external format - such as a CSV or other data structure that allows for users to inspect codes and modify if desired.

Would need to provide documentation on how to modify.

If there are issues or changes with the set of ICD codes that go with a particular CCC, this might make it easier for users to make a pull request as they wouldn't need to be familiar with the source code.