Clean up FSharp.CompilerBinding agent API

[rneatherway]

From @rneatherway on October 22, 2014 15:58

Comment in FSharp.AutoComplete/Program.fs:

// TODO: Clean up the API these options are being generated to call
//
// That API is in FSharp.CompilerBinding.LanguageService.
// 1. It expects a Target Framework, but only for FSI as
// FCS is rumoured not to return references including FSharp.Core
// and it uses the framework to guess where it is.
// We will just use 4.5.
// 2. The CompileFiles just get added to the options, so we will do that
// here and then pass in an empty array of CompileFiles.

Any changes will also affect monodevelop binding.

Copied from original issue: fsprojects/zarchive-fsharpbinding#772

[rneatherway]

From @7sharp9 on December 15, 2014 14:6

Is this now complete then?

[rneatherway]

From @7sharp9 on April 29, 2015 15:51

I removed the XS label as this is no longer an issue there as its "evolving"