Props (#3029)

* Remove comment ifdefs

* Add Microsoft.NET.Sdk.FSharp.props

* Make TargetFrameworks work

* restore {BuildSuffix}

* rename sdk targets and props, refactor project logic into our repo

* wrong name

* Add automagic FSharp.Core reference for coreclr

* Set <DefaultProjectTypeGuid to F# project system guid

* Fix setup

* Update sdk props

* Typo for net461

src/fsharp/FSharp.Build/Microsoft.FSharp.NetSdk.targets

@@ -69,7 +69,7 @@ WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and
 
   <PropertyGroup Condition=" '$(DisableAutoValueTupleReference)' != 'true' ">
     <FrameworkNeedsValueTupleReference Condition=" $(TargetFramework.StartsWith(netcoreapp1.)) or $(TargetFramework.StartsWith(netstandard1.)) ">true</FrameworkNeedsValueTupleReference>
-    <FrameworkNeedsValueTupleReference Condition=" '$(TargetFramework)' == 'net40' or '$(TargetFramework)' == 'net45' or '$(TargetFramework)' == 'net46' or '$(TargetFramework)' == 'net61' or '$(TargetFramework)' == 'net462' or '$(TargetFramework)' == 'net47' ">true</FrameworkNeedsValueTupleReference>
+    <FrameworkNeedsValueTupleReference Condition=" '$(TargetFramework)' == 'net40' or '$(TargetFramework)' == 'net45' or '$(TargetFramework)' == 'net46' or '$(TargetFramework)' == 'net461' or '$(TargetFramework)' == 'net462' or '$(TargetFramework)' == 'net47' ">true</FrameworkNeedsValueTupleReference>
   </PropertyGroup>
 
   <ItemGroup  Condition=" '$(TargetFramework)' != '' ">