Fix #1805

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

Syntax correction.

Fix #1130
Adds the server id in the SQL query for userSessionExists function.

Rather than having the username limitations hard coded, I have moved it
into the ini file. I have added some examples to the code and also to
the ini.

This is only and example and can be expanded on by others.

 * 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...

Now uses regex.
Added "."
Updated login message

Can now only be made up of [a-z][A-Z][0-9][-_]