Framework Targeting: .NET Core parity with .NET Framework

This is a bug that is tracking .NET Core scenario parity with .NET Framework with regards to framework targeting inside Visual Studio. The following scenarios do not work when targeting .NET Core:

Scenario|Add/Remove a framework reference to/from a project
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Scenario|Add a template to a project that adds framework references
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Scenario|Drag a control onto a designer that add framework references
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Scenario|Automatically add framework references based on missing types (and undo)
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