Pros: Updates config
Cons: Doesn't keep documentation within config files so config names have to be self explanatory.

--- Update Prep ---
1. Open config file for reading
2. Read config settings and store as variables (in an array): old[configname] = currentvalue
3. Close file AND (delete OR rename)
4. Create new config file with same name
6. Open rule file for reading
7. Read rule file and store as variables (in an array): new[configname] = delete OR its new value
8. Open config for reading file for writing
--- Begin Update ----
9. If ( old[configname] !== new[configname] ) AND NOT ( new[configname] = null ) THEN old[configname] = new[configname]
10. If ( old[configname] == delete ) THEN write configname = value to file.
11. Close config file