Duplicate Project feature should ignore .git directory

[1player]

I have a skeleton project I use as a base. I have duplicated it, done some work, committed to git until I discovered that I had been committing to the skeleton's git repository. When I duplicated the project, the .git directory got duplicated too.

I believe it's best, upon duplicating a project, to skip the .git directory so every clone can set up their own git history that's separate from the original project.