Remember previously used server addresses (hostnames and IPs)

Feature Request

When switching between servers, re-typing different hostnames is a little tedious, especially in development where I frequently change which computer is the server.

It would be handy if the server address (hostname/IP) field was a combo textbox dropdown which I could type new addresses into but also select previously used ones.

Edit: This feature should work as follows

1. The object lineHostname should be an editable combo box renamed to cbHostname
   • Pressing Enter should after typing should attempt to connect to the server
   • Only when connected should a new item be added to the server history
   • Cap the history at 10 servers
   • Proper validator so non valid names are not able to be entered
2. Create a new key for serverHistory under the client section in settings maybe client/connectionHistory
   • Save as a QStringList of valid server name / ip
3. Update client options to have a button that will clear the server history
   • Clear the list of history, Keep the currently connected server (if any) in the combobox.