fix memory leaks in FRED and QtFRED - #7784
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Neither editor had a teardown to match FSO's game_shutdown(), so the engine data they set up was never freed. Add editor_free_engine_data() to free it, and call it from a new fred_shutdown() in FRED and from qtFRED's shutdown(), before the graphics system closes. Also: - Delete FRED's modeless editors if they are still open at exit. - Make FRED's dialog tooltips and sexp tree image lists members, since they were leaked or depended on OnDestroy() being called. - Parent qtFRED's item models so they are deleted with their widgets. - Enable the CRT leak report in qtFRED, which previously had none. - In qtFRED, call shutdown() last in closeEvent(), since it destroys the window. - Make the preferences path and user SID strings function-level statics, so MFC's leak dump no longer reports them as leaks. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Neither editor had a teardown to match FSO's game_shutdown(), so the engine data they set up was never freed. Add editor_free_engine_data() to free it, and call it from a new fred_shutdown() in FRED and from qtFRED's shutdown(), before the graphics system closes.
Also:
they were leaked or depended on OnDestroy() being called.
window.
so MFC's leak dump no longer reports them as leaks.
Depends on #7781; in draft until that is merged.