Ban based notification to other online moderators is the first form implemented by this PR.

When in none auth mode, registered users don't exist; hence the setting
makes the game impossible to join.

Normally the setting would be greyed out when the user is unregistered,
but commit 475c54bf introduced a new edge case where the stored setting
would apply to the field even if the user is unregistered, making the
setting possible to apply in no-reg mode. Regardless, any client could
have done this, not just the default cockatrice.

The server side fix should prevent all issues in the future.

Moved the RegOnlyRequirement functions out of the Database interface into the proper Server block of code.

Changed the default value for the client keep alive variable back to 1 (since that is what the setting is if the value is not found in the configuration ini file).

 * Refactored code out of common/ into servatrice/
 * added smtp client library
 * disable registration when connected
 * validate email address
 * send activation token via email

 * added missing bits of serverside code;
 * added fronted in client;
 * removed demo python scripts;

Stub for registration command handling in server

First draft of handling registration requests

WIP (will be rebased)

clean up bad imports (rebase this later)

Finish checkUserIsBanned method

Add username validity check

Check servatrice registration settings

WIP

Finish(?) server side of registration

Needs testing

Fix switch case compile failure

I have no idea why I have to do this

WIP for registration testing python script

Stub register script initial attempt

Rearrange register script

First try at sending reg

register.py sends commands correctly now

Add more debug to register.py

Pack bytes the right way - servatrice can parse py script sends now

register.py should be working now

Parse xml hack correctly

Log registration enabled settings on server start

Insert gender correctly on register

Show tcpserver error message on failed gameserver listen

Fail startup if db configured and can't be opened.

TIL qt5 comes without mysql by default in homebrew...

Implemented the ability to set the server to only allow registered
users.  Also updated client to reflect the log-in rejection as well as
put a check in place for the server to not start if db connection is not
available yet registration is required.

Specifically this should cover people connecting with a username of
"\u200C"

improved code for automatic joining of persistent games; disconnecting + reconnecting works as it should with ISL

added mutex for RNG, moved game command implementation from S_PH to S_Player in preparation for forwarding of game commands via tunneling interface