Encapsulate CGraph member variables

Make the member variables private and add `SetMin` to replace a usage of the member variables in `CDebugHud`. For completeness/symmetry, `SetMax` is also added.

src/engine/client/client.cpp

@@ -84,11 +84,21 @@ static const ColorRGBA gs_ClientNetworkErrPrintColor{1.0f, 0.25f, 0.25f, 1.0f};
 
 void CGraph::Init(float Min, float Max)
 {
-	m_MinRange = m_Min = Min;
+	SetMin(Min);
-	m_MaxRange = m_Max = Max;
+	SetMax(Max);
 	m_Index = 0;
 }
 
+void CGraph::SetMin(float Min)
+{
+	m_MinRange = m_Min = Min;
+}
+
+void CGraph::SetMax(float Max)
+{
+	m_MaxRange = m_Max = Max;
+}
+
 void CGraph::Scale()
 {
 	m_Min = m_MinRange;

src/engine/client/client.h

@@ -47,13 +47,17 @@ public:
 		MAX_VALUES = 128,
 	};
 
+private:
 	float m_Min, m_Max;
 	float m_MinRange, m_MaxRange;
 	float m_aValues[MAX_VALUES];
 	float m_aColors[MAX_VALUES][3];
 	size_t m_Index;
 
+public:
 	void Init(float Min, float Max);
+	void SetMin(float Min);
+	void SetMax(float Max);
 
 	void Scale();
 	void Add(float v, float r, float g, float b);

src/game/client/components/debughud.cpp

@@ -183,7 +183,7 @@ void CDebugHud::RenderTuning()
 			}
 			if(i == 0)
 			{
-				m_ZoomedInGraph.m_Min = m_ZoomedInGraph.m_MinRange = RampedSpeed;
+				m_ZoomedInGraph.SetMin(RampedSpeed);
 			}
 			pv = RampedSpeed;
 		}