refine 1.4 {LOYAL_UNIT} replacement code to cover variable x,y and report to stdout
extend auto-recognition to macros with variable x,y
refine backslash replacement to exclude comments, include mask files, and add word boundary for extra safety
refine userdata/ purge to cover multiple instances on a line and to report to stdout
add explanation about "wmllint: usagetype" magic comment; side note about character macro auto-recognition
convert old UMC from data/campaigns to data/add-ons, while ensuring that mainline isn't clobbered
reduce wordiness of usage type comment