Invoke-FuzzyGitStatus -> Invoke-PsFzfGitFiles
Invoke-FuzzyGitStatus -> Invoke-PsFzfGitFiles

- Invoke-FuzzyGitStatus calls Invoke-PsFzfGitFiles, which does the same
  thing except it displays a preview window
- Resolves #143

kelleyma49/PSFzf,kelleyma49/PSFzf