allow whitelist & blacklist dependencies

[empus]

• Add ability to make list entries dependent on others
• Allow recursion so these dependencies can go multiple layers deep
• Prevent rescanning the same IDs multiple times during recursive matching
• Avoid infinite loops
• Prevent a whitelist from being dependent on a blacklist (and vice versa)
• Prevent list entries from being deleted if others are dependent on it
• Utilise the reason and action from the first matching entry
• Concatenate all matching IDs in resulting kick messages, op and report chan notices

Credit for idea goes to psycho @ Undernet

[empus]

TODO:

• [x] Only increment hit count (for each entry ID) after all dependencies are met
• [ ] Prevent list entries from being deleted if others are dependent on it