Feature: Server Edit Menu. Closes #677

## Added a Server Edit menu and changed the UI a little.
Changes:
* Edit and Add menu are now a separate window
* Creating or Replacing a server does not leave it selected in the list. This was a flow choice
* Selecting a server will change the menu item to "Edit" instead of "Add Server"
* The menu for Edit and Add are exactly the same and are Server Name dependent on their function

Server Edit Menu. Extension of the add menu. Couple UI functionality
changes also.

So menu per normal:
http://i.imgur.com/rwgEH5X.png
Pressing Back will go back to the KSP Main Menu

Clicking Add Server:
http://i.imgur.com/4Fz6YHY.png

As you can see mostly the same as before except the other controls are hidden.
Pressing Cancel or Back will both go back to the Server List, not back to the KSP Main Menu

After clicking new:
http://i.imgur.com/HA0tgdZ.png

You can see the server was added fine.

Selection of a server, per usual: 
http://i.imgur.com/GzzXYM5.png

Notice how the buttons all change.
Clicking edit presents this menu:

http://i.imgur.com/gI0bORC.png

I can change or fix anything on demand, just let me know and I'll update the branch. Cheers.