RM-4232:
1. If the user adds a percentage (other than for placeholders) then it is stripped off.
2. Backslash is getting removed in the connection string if we provide the backslash(\) in placeholders or the database name contains it.
3. If the user added only spaces( )in placeholders it is not getting reset to default values.
RM-4230:
1. Rename panel option is not working in the debugger.
2. Added Rename panel for schema diff.
Fixes#4232#4230
1. Show servers with server groups in the dropdown.
2. Highlighted current selected connection in the new connection dropdown.
3. Notify the user before changing the connection.
refs #3794
1. Updated connection success message. (Added database name in the success message.)
2. Resolve issue of the mouse pointer and dropdown will show below the connection string only.
3. Added loader for both new connections and load existing connections.
4. Removed async: false for update connection.
refs #3794
