Move templates to their own import.

This should allow the project to open properly in windows as well as
reduce IDE clutter.
Change tabs to spaces
Move F# XS addin specific files from Fsharp.CompilerBinding into the addin direct.
Correct Tests FSC reference and add missing project file.
Revert choice element and default to net45 for FCS references
Merge pull request #810 from 7sharp9/project_fixes

Project fixes and clean up of Fsharp.CompilerBinding