Update Gamepad.axes / GamepadButton.value to match the latest specification

Source/modules/gamepad/GamepadButton.h

Index: Source/modules/gamepad/GamepadButton.h
diff --git a/Source/modules/gamepad/GamepadButton.h b/Source/modules/gamepad/GamepadButton.h
index 59392d24bacfc41d437f0a0ac92f8bff4b2284ef..422cf1df858b94a0ae6eab9d8502600a19965b45 100644
--- a/Source/modules/gamepad/GamepadButton.h
+++ b/Source/modules/gamepad/GamepadButton.h
@@ -17,8 +17,8 @@ public:
     static GamepadButton* create();
     ~GamepadButton();
 
-    float value() const { return m_value; }
-    void setValue(float val) { m_value = val; }
+    double value() const { return m_value; }
+    void setValue(double val) { m_value = val; }
 
     bool pressed() const { return m_pressed; }
     void setPressed(bool val) { m_pressed = val; }
@@ -27,7 +27,7 @@ public:
 
 private:
     GamepadButton();
-    float m_value;
+    double m_value;
     bool m_pressed;
 };