Upgrade to FCS 0.0.71

* Move project parsing code to FCS
* Also move unit tests to FCS
* Update to match renames in FCS SourceCodeServices
Update appveyor emacs link
Update to FCS 73
Update Emacs link in AppVeyor
Merge pull request #773 from rneatherway/fcsprojectparser

Use FCS Project parser for FSharp.AutoComplete