Close windows before loading another save #2487

Job	Run time
Lint Commit Message	0s
Check code formatting	37s
Check changelog formatting	6s
Get version info	22s
g2.dat	11s
Ubuntu Linux (noble, x86_64, portable)	11m 5s
Ubuntu Linux (noble, debug, [http, network, flac, vorbis OpenGL] disabled) using clang	11m 28s
Debian Linux (bookworm, x86_64, portable)	10m 12s
Android	14m 12s
Ubuntu Linux (AppImage, x86_64)	12m 3s
Ubuntu Linux (debug) using clang, coverage enabled	14m 38s
macOS (x64) using CMake	6m 2s
Windows (win32) using mingw	9m 0s
macOS (arm64) using CMake	5m 23s
Windows (win32)	8m 20s
Windows (x64)	8m 44s
Windows (arm64)	8m 49s
Ubuntu Linux (Docker)	0s
macOS universal app bundle	40s
Release	0s
	2h 1m 52s

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