Park editor: saved object sets; duplicate selections; group local axes

Sets: save a selection under a name and place it again anywhere, on any map.

- The library gets an OBJECTS / SETS switch. SETS saves the selected
  objects as a set and lists the saved sets to place or delete (Delete asks
  for a second press).
- A set is a park file in <profile>/object_sets/<name>.park.json, so it
  shares the park format, its 2 MB limit and its name rules. Positions are
  relative to the set's anchor: the middle of its footprint, at its lowest
  origin.
- Placing follows the cursor as one wire cube per object, on surfaces or
  the grid plane; the mouse wheel turns it by the angle step. A click
  pastes the whole set: one undo step, under the paste path's object and
  session limits. Sets with objects missing from the catalog cannot be
  placed.
- A placed or pasted group is then selected with the move gizmo.

Editing groups:

- Local axes work for multi-selections. A placed set's axes are the
  rotation it was placed with, plus every later turn; any other group uses
  its last selected object's rotation. Applying a moved group does not snap
  its own rotation to the angle grid.
- Duplicate (button or Ctrl+D) copies every selected object at its saved
  position, rotation and scale, one grid step along X, as one paste.
- On a server with object scaling off, pastes (sets, duplicates, Ctrl+V)
  are made at 1x.

Tests cover set storage (anchor, round trip, replace, names, damaged files,
delete), saving and placing a set through the UI (surface, wheel, one
paste, no live preview), selecting it with its own axes, moving it along
them, and duplicating with and without scaling.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Runtime/runtime_init.cpp

@@ -268,6 +268,7 @@ extern "C" __declspec(dllexport) BOOL WINAPI DingoSDKDebugInitialize() {
         dingosdk::overlay::set_park_preview_queue(dingosdk::queue_local_park_preview);
         dingosdk::overlay::set_park_selection_queue(dingosdk::queue_local_park_selection);
         dingosdk::overlay::set_park_paste_queue(dingosdk::queue_local_park_paste);
+        dingosdk::overlay::set_park_object_set_queue(dingosdk::queue_local_park_object_set);
         dingosdk::overlay::set_park_delete_queue(dingosdk::queue_local_park_delete);
         if (!DingoSDKOverlayStartV3(&callbacks)) {
             dingosdk::logging::write(dingosdk::logging::Level::error, dingosdk::logging::Channel::graphics, "Overlay startup failed.");