Refactor Start-EditorServices.ps1 based on feedback

[TylerLeonhardt]

There is some feedback given in this PR of some parameter clean up:
#629

It wasn't blocking for the PR so this is the issue to remember to do that refactoring.

[jpogran]

Most, if not all of the feedback mentioned seems to already have been accomplished in 487ad1d. I think this can be closed

[TylerLeonhardt]

Yep! You're totally right. We can close this. @rjmholt will be refactoring it more (porting to a binary module) but that doesn't need this to be open.