Implement message network framework

[NuSkooler]

A message network framework needs implemented. This will allow for various networks (e.g. FidoNet/FTN, QWK based, etc.) to integrate & import/export with the system. I have a design I'm working on for this. This bug is for tracking / relating existing issues.

Some general notes on what's coming:

• The system will be "layered" allowing different import/export processors (e.g. tossers/etc.) to exist in an abstract way.
  • Conferences are being introduced. These are simply organizational groups of message areas
  • All area_name stuff in DB/code is being renamed to area_tag
  • A new configuration structure for conferences, areas, and message network mappings will be introduced (e.g. for config.hjson)
  • Initial proof of concept will be FTN processing. Next will very likely be QWK.

Current design for menu.hjson message areas & conferences is something like such:

conferences: {
    agn: {
        name: Agoranet
        desc: The Official Network of ACiD Productions

        //  simple ACS for access
        acs: THEACSSTRING

        areas: {
            agn_bbs: {
                name: BBS Discussion
                desc: General BBS discussion

                //  ACS for what users can do here
                acs: {
                    read: THEACSSTRING
                    write: THEACSSTRING
                    manage: THEACSSTRING
                }
                default: true
            }
        }
    }
}

[NuSkooler]

For anyone interested, this is being worked on in the msg_network branch

[NuSkooler]

The msg_network branch has been merged to master @ 6f8f8f7

There are likely bugs of course. Those will be separate issues.