Update Runtime imports of FSharp.Core.dll, FSharp.CompilerBinding.dll, FSharp.CompilerService.dll to use "<Import file" rather than "Import assembly"

This fixes issue https://github.com/fsharp/fsharpbinding/issues/509

The use of <Import assembly causes a LoadFrom which doesn't follow the usual assembly redirects for FSharp.Core.  See the issue above for full details.
Modify Android projects so that a unversioned reference of FSharp.Core and mscorlib is used via <TargetFrameworkIdentifier>MonoAndroid</TargetFrameworkIdentifier>
Modify iOS project templates so that an mscorlib reference is included.
bump version number
Added Fix for Bugzilla: https://bugzilla.xamarin.com/show_bug.cgi?id=20102

Placed conditional elements around all of the extensions points.
Revert "Added Fix for Bugzilla: https://bugzilla.xamarin.com/show_bug.cgi?id=20102"

This reverts commit f1064d067381e4f7a525c017fa8dc6591d8b9e42.
Added Fix for Bugzilla: https://bugzilla.xamarin.com/show_bug.cgi?id=20102

Added less intrusive fix to 20102
Added condition to exclude FSI Ide commands is F# is not installed.