QoL: 3D navigator (#4181)

* Initial integration of ImGuizmo

* Fix mouse capture

* Fix frame update

* Update face color

* Show current camera rotation

* Fix coord mapping

* Update camera rotation from 3d navigator

* Use orthographic

* Render axis

* Make the axis color lighter if at back

* Show axis label

* Fix linux build

* Move to separate method

* Refine

* Add option to show/hide 3d navigator

* Add license info

* Handle dpi scaling

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Co-authored-by: SoftFever <softfeverever@gmail.com>

src/slic3r/GUI/Camera.hpp

@@ -146,6 +146,8 @@ public:
     // rotate the camera around three axes parallel to the camera local axes and passing through m_target
     void rotate_local_around_target(const Vec3d& rotation_rad);
 
+    void set_rotation(const Transform3d& rotation);
+
     // returns true if the camera z axis (forward) is pointing in the negative direction of the world z axis
     bool is_looking_downward() const { return get_dir_forward().dot(Vec3d::UnitZ()) < 0.0; }