Fry3DX 0.4: an easy 3D modeller

Shapes with live settings, shape editing, knife and hole tools, drawing
shapes onto other objects, combining objects (add / subtract / overlap),
copies, thickness, painting with stickers and layers, a Layout tab, a
Print tab with checks, packed .fry files with autosave, export to GLB,
glTF, FBX, OBJ, 3MF, STL and PLY, folders in Layers, its own crash
screen, and a website for GitHub Pages in docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMSrd5oe1GpUD7E6d825KP

engine/core/pch.h

@@ -0,0 +1,21 @@
+#pragma once
+// Precompiled for the engine's libraries (engine/CMakeLists.txt): the standard library and glm
+// headers nearly every file pulls in, parsed once per library instead of once per file.
+#include <algorithm>
+#include <cmath>
+#include <cstdint>
+#include <cstring>
+#include <filesystem>
+#include <format>
+#include <functional>
+#include <map>
+#include <memory>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/quaternion.hpp>