Add configure script for windows

The new configure.bat script does the same as configure.sh, but using
a c# app (which will eventually be reused for configure.sh too).
The windows fsproj and addin.xml files have been removed from the repo,
since they are now generated. Also fixed paths in the orig fsproj.
Use the new configuration app for mac and linux
Remove use of local Fsharp compiler to fix build on Windows as part of MonoDevelop
Fix build on Mac
normalize formatting in addin.xml files
remove old logic from project file
Use configuration script portable between Windows and Mac/Linux
fix configuration on Windows
remove file generated by configuration
Update README.md with new instructions
cosmetic fixes to configure.fsx
remove further unused dependencies