VideoCommon: change freelook camera fov step size and expose it

Source/Core/VideoCommon/FreeLookCamera.cpp

@@ -236,13 +236,18 @@ void FreeLookCamera::Rotate(const Common::Vec3& amt)
 void FreeLookCamera::IncreaseFovX(float fov)
 {
   m_fov_x += fov;
-  m_fov_x = std::clamp(m_fov_x, 0.1f, m_fov_x);
+  m_fov_x = std::clamp(m_fov_x, m_fov_step_size, m_fov_x);
 }
 
 void FreeLookCamera::IncreaseFovY(float fov)
 {
   m_fov_y += fov;
-  m_fov_y = std::clamp(m_fov_y, 0.1f, m_fov_y);
+  m_fov_y = std::clamp(m_fov_y, m_fov_step_size, m_fov_y);
+}
+
+float FreeLookCamera::GetFovStepSize() const
+{
+  return m_fov_step_size;
 }
 
 void FreeLookCamera::Reset()

Source/Core/VideoCommon/FreeLookCamera.h

@@ -54,6 +54,7 @@ public:
 
   void IncreaseFovX(float fov);
   void IncreaseFovY(float fov);
+  float GetFovStepSize() const;
 
   void Reset();
 
@@ -68,6 +69,8 @@ private:
   float m_fov_y = 1.0f;
   std::optional<FreelookControlType> m_current_type;
   std::unique_ptr<CameraController> m_camera_controller;
+
+  float m_fov_step_size = 0.025f;
 };
 
 extern FreeLookCamera g_freelook_camera;