Raylib camera unification - #502
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…camera code Extends raylib_widgets::OrbitCamera with an Euler-angle + orthographic mode (rotateX/rotateY/translate/rotationCenter, ortho zoom/pan, 8 view presets, eased transitions) ported from multi_view_tls_registration_step_2's old GLUT-derived camera, driven through rlgl's manual matrix stack. The pre-existing azimuth/elevation/distance/target mode (used by camera_lidar_calibration/camera_lidar_intrinsics_calib) is untouched. - step2: migrated onto the shared OrbitCamera; rl_utils.cpp/.h deleted entirely -- generic pieces (ShowMainDockSpace, ImGuiHyperlink, an info window, double-precision ray/plane math) moved into raylib_widgets (AppShell.h/.cpp, RayPlaneD.h/.cpp), the rest folded directly into multi_view_tls_registration_gui.cpp since nothing else used it. - camera_lidar_trajectory_viewer: switched from raylib's Camera3D/ BeginMode3D onto the same Euler/rlgl camera engine as step2, dropping its toRL() Y-up render-space remap (renders in native Z-up world coordinates now, matching step2 and the GPU point cloud shader, which already reads the live rlgl matrix stack each frame regardless). - New shared raylib_widgets pieces used by both apps: OrbitCamera:: eulerScreenRay(), end3DMatrixStack(), showEulerCenterOfRotationWindow(), pickNearestPointOnLine() (nearest trajectory point to a ray, no cutoff). - Fixed trackpad-specific issues: OrbitCamera::zoom() now scales by the actual scroll magnitude instead of a quantized +-1 step; drag handling in both apps ignores input while Ctrl/Shift is held so a modifier-click's jitter can't be misread as a drag that cancels the transition it just started; camera_lidar_trajectory_viewer's Ctrl detection now also recognizes Cmd (Super) on macOS. Also ports two more pieces of the legacy GLUT apps' rendering (core's PointCloud(s)::render(), unusable under raylib's core-profile GL context) into step2's GPU-based ScanRenderer: intersection cross-section slabs (xz/yz/xy_intersection, filtered in the point shader via a fragment discard; the trajectory overlay is hidden outright while a slab is active, matching the original) and the corresponding reference grids (xz/yz/xy_grid_10x10/1x1/0.1x0.1, drawn via rlgl immediate-mode lines). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
raylib's default exit key (Esc) closes the window outright, which is too easy to trigger by accident (e.g. backing out of a dialog or gizmo drag). SetExitKey(KEY_NULL) disables it; neither app binds a replacement quit key. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Manual tests:
https://youtu.be/IHgCUQOg24c