feat: Add a Qt object tree view in the debug widget. #587

Job	Run time
Fedora with ASAN	0s
Update nightly release tag	4s
Debian (minimal, Debug)	5m 39s
Ubuntu LTS (full, Release)	6m 31s
Clang-Tidy	0s
Check for translatable strings	0s
Alpine (full, Debug)	11m 57s
Docs	1m 56s
macOS user	0s
Android (arm64-v8a, Release)	5m 40s
Flatpak	10m 44s
Windows (i686, Debug)	7m 12s
macOS distributable (x86_64)	8m 29s
Windows (i686, Release)	6m 33s
macOS distributable (arm64)	3m 40s
Windows (x86_64, Debug)	8m 56s
Windows (x86_64, Release)	8m 11s
	1h 25m 32s

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