Clean up angle constants and conversions (#1135)

* Add angle conversion constants and macros

* Replace angle literals with hex instead of decimal

src/d/d_picture_box.cpp

@@ -401,7 +401,7 @@ void dJle_Pb_c::zoomScale() {
         }
         else {
             f32 cameraZoomForcus = dComIfGp_getCameraZoomForcus(0);
-            mDoAud_seStart(JA_SE_TELESCOPE_ZOOM, NULL, cameraZoomForcus * 32768.0f + 0.5f);
+            mDoAud_seStart(JA_SE_TELESCOPE_ZOOM, NULL, cameraZoomForcus * 0x8000 + 0.5f);
         }
     }
 }