auto-name new payload configuration

[upyr1]

When we create and save a new payload configuation in the payload editor, DCS should generate the default name like 4X AGM-65 

[Casablanca]

+1. This feature will take 30 seconds to code, and 30 more to test and upload to code repository.

[upyr1]

I am shocked it isn't in there already 

[Tom Kazansky]

+1