Support options for different handling of track changes
Now that the basic functionality to extract character insertion/deletion track changes into HTML is part of the initial extraction sheet, it's easy to comment that bit out if that's not desired.
We should consider how to give options to XSweet users who may want to handle track changes differently: accept or reject them all away, drop them at a later stage, etc.
- This could possibly be managed with runtime flags
- We could also have a standalone sheet in the pipeline that a user could tweak to specify how to handle track changes: accept them all, reject them all, etc. This could work by passing in a runtime option, commenting/uncommenting the desired sections, etc.