Change SQL Server support of mRemoteNG

Hi,

That's a feature request.

Currently, mRemoteNG allows to have connection configurations on a SQL Server.
That's a great feature, but it lacks some things:

First, maybe the configuration from SQL Server should be in folder-level and not application level. For example, you can share some folder with your teammates via SQL Server and have all of us the same configurations, but allow too to have a "local" connections folder not stored on SQL (not shared connections).

Second, allow to have a "offline-copy" of the connections, or use SQL as a sync repository. With the actual situation of home-working, sometimes you cannot enter the SQL server but you need to use a connection. That's can be resolved if SQL are used as a sync repository (if you create a new connection offline, when SQL is reachable these connection will be uploaded. Also, if other people creates the connection, then your client download it).

That's can be related with #1949 comment of better SQL Server support. I think the AD intergration commented here would be wonderful, but not everytime you can rely on AD to enter computers (for example on my case I use lot of computers from my AD, but also lots of computers from outside).