Change Connection Settings Edit Button behavior

[JohannesMP]

In the 0.1.6.0 test builds, when you click 'Edit' on an existing server entry in the server browser, you will see three buttons below the server info fields: New, Replace, and Cancel

Currently the behavior is as follows when you select a server and click the 'Edit' Button:

• Cancel is always enabled (which is as it should be)
• With no changes, New is Disabled and Replace is enabled
• With changes to the Address or Port, New is disabled and Replace is enabled
• With changes to the Server Name, New is enabled and Replace is disabled.

I think it would make more sense if Replace was changed to Save, and the menu exhibited the following behavior:

• With no changes both New and Save are disabled, with the only clickable option being Cancel (which as before is always active).
• With changes to the Address or Port, New should remain disabled and Save should be enabled
• With changes to the Server Name Both New and Save should be enabled. This allows you to duplicate an entry as well as save over an existing one without having to go back and delete the old name entry as you currently have to when you want to change the name.

[TehGimp]

Partially implemented by 7020519, but still lacking the ability to change the name of a previous entry without deleting the old one.