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.
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