Look into checking for SQL injections

[firefly2442]

-Use of prepared procedures would help mitigate this. Add this to the readme.
-While it's explained in the readme NOT to use the root user and that there are no SQL sanity checks, this is clearly not enough and people are not paying attention. Add a check and disallow root user.
-Add in escaping for all queries to attempt to prevent exploits.

[firefly2442]

Also add note in readme explaining using the root Arma3 directory for the Databases.txt file is a potential security risk.

[firefly2442]

See 7b8dcf0, 96f6a73, 88bba70 among others. This will need to be mostly mitigated on the SQF mission side.