[WIP] Various improvements to m_remove.

- Merge FPART and REMOVE and allow the channel and user to be sent in any order
- Remove code preventing ulines from being removed (use m_servprotect damnit).
- Remove configuration option for disabling nokicks mode (I see no valid use case for this)
- Allow people ranked 50000 to be removed (previously the hardcoded founder level).
- Various other improvements.