Cook task for projects needs to use project's editor target for EditorExe

[hach-que]

This:

<Cook
  Project="$(UProjectPath)"
  Platform="$(CookPlatform)"
  Tag="#$(TargetType)CookedContent_$(TargetPlatform)_$(CookFlavor)"
  Versioned="True"
  Arguments="-CreateReleaseVersion=&quot;$(ReleaseVersion)&quot;" />

should probably be:

<Cook
  Project="$(UProjectPath)"
  Platform="$(CookPlatform)"
  Tag="#$(TargetType)CookedContent_$(TargetPlatform)_$(CookFlavor)"
  Versioned="True"
  EditorExe="$(ProjectRoot)\Binaries\Win64\$(EditorTarget)-Cmd.exe"
  Arguments="-CreateReleaseVersion=&quot;$(ReleaseVersion)&quot;" />

EditorExe probably needs some magic so it's not set if the EditorTarget is legitimately UnrealEditor (which would be the case for blueprint-only projects)