Frame interp: Revised camera system

FOV is now smooth, and the individual hacks for stars and Epona's reins are removed

src/m_Do/m_Do_graphic.cpp

@@ -2229,13 +2229,11 @@ int mDoGph_Painter() {
 
 #if TARGET_PC
             if (dusk::getSettings().game.enableFrameInterpolation) {
-                cXyz pres_eye;
-                dusk::frame_interp::camera_eye_from_view_mtx(j3dSys.getViewMtx(), &pres_eye);
                 // FRAME INTERP NOTE: Currently only recalculating points for Epona's reins. Need a more global solution.
                 if (daHorse_c* horse = dComIfGp_getHorseActor()) {
                     horse->lerpControlPoints(dusk::frame_interp::get_interpolation_step());
                 }
-                g_dComIfG_gameInfo.drawlist.refresh3DlineMats(pres_eye);
+                g_dComIfG_gameInfo.drawlist.refresh3DlineMats(camera_p->view.lookat.eye);
             }
 #endif
 

src/m_Do/m_Do_main.cpp

@@ -253,7 +253,10 @@ void main01(void) {
                 accumulator -= kSimStepSeconds;
             }
             dusk::frame_interp::interpolate(static_cast<float>(accumulator / kSimStepSeconds));
-            cAPIGph_Painter();
+            {
+                dusk::frame_interp::PresentationCameraScope presentation_camera;
+                cAPIGph_Painter();
+            }
         } else {
             accumulator = 0.0;