Implement more options

- Invisible guests
- Invisible staff
- See-through trees
- Invisible trees
- Strings/Ids

src/openrct2/interface/Viewport.h

@@ -53,6 +53,10 @@ enum
     VIEWPORT_FLAG_INVISIBLE_RIDES = (1 << 21),
     VIEWPORT_FLAG_INVISIBLE_SCENERY = (1 << 22),
     VIEWPORT_FLAG_INVISIBLE_PATHS = (1 << 23),
+    VIEWPORT_FLAG_INVISIBLE_GUESTS = (1 << 24),
+    VIEWPORT_FLAG_INVISIBLE_STAFF = (1 << 25),
+    VIEWPORT_FLAG_SEETHROUGH_TREES = (1 << 26),
+    VIEWPORT_FLAG_INVISIBLE_TREES = (1 << 27),
 };
 
 enum class ViewportInteractionItem : uint8_t