Updating GraphingInterfaces to use Graphing Engine 2.0 (#561)

* Updated Graphing Interfaces to version 2.0.1

src/GraphingInterfaces/IEquation.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Common.h"
+#include "IEquationOptions.h"
+
+namespace Graphing
+{
+    struct IEquation : public NonCopyable, public NonMoveable
+    {
+        virtual ~IEquation() = default;
+
+        virtual std::shared_ptr<IEquationOptions> GetGraphEquationOptions() const = 0;
+
+        virtual unsigned int GetGraphEquationID() const = 0;
+
+        virtual bool TrySelectEquation() = 0;
+        virtual bool IsEquationSelected() const = 0;
+    };
+}