Various code cleanup & little performance improvement on HTTP download (#5772)

* Disable or remove unused enum members/functions
* Tiny code style fixes
* Make some functions const
* Replace ClientMediaDownloader std::unordered_map with std::map

src/camera.h

@@ -64,22 +64,6 @@ public:
 			Client *client);
 	~Camera();
 
-	// Get player scene node.
-	// This node is positioned at the player's torso (without any view bobbing),
-	// as given by Player::m_position. Yaw is applied but not pitch.
-	inline scene::ISceneNode* getPlayerNode() const
-	{
-		return m_playernode;
-	}
-
-	// Get head scene node.
-	// It has the eye transformation and pitch applied,
-	// but no view bobbing.
-	inline scene::ISceneNode* getHeadNode() const
-	{
-		return m_headnode;
-	}
-
 	// Get camera scene node.
 	// It has the eye transformation, pitch and view bobbing applied.
 	inline scene::ICameraSceneNode* getCameraNode() const
@@ -160,13 +144,13 @@ public:
 		else
 			m_camera_mode = CAMERA_MODE_FIRST;
 	}
-	
+
 	// Set the current camera mode
 	inline void setCameraMode(CameraMode mode)
 	{
 		m_camera_mode = mode;
 	}
-	
+
 	//read the current camera mode
 	inline CameraMode getCameraMode()
 	{