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Tests: Add basic unittests for `CInifile` #262

Job	Run time
FreeBSD Debug x86_64	1s
Ubuntu Debug amd64 (gcc)	1s
FreeBSD Release x86_64	1s
Ubuntu Release amd64 (gcc)	1s
Windows Debug x64 (msvc)	7m 4s
OpenBSD Debug x86_64	1s
Ubuntu Debug amd64 (clang)	1s
OpenBSD Release x86_64	1s
Windows Debug x86 (msvc)	6m 47s
Ubuntu Release amd64 (clang)	1s
NetBSD Debug x86_64	1s
Alpine Debug x86_64 (gcc)	1s
Windows Mixed x64 (msvc)	5m 47s
NetBSD Release x86_64	1s
Alpine Release x86_64 (gcc)	1s
Windows Mixed x86 (msvc)	6m 0s
Windows Release x64 (msvc)	10m 58s
Alpine Debug x86 (gcc)	1s
Windows Release x86 (msvc)	8m 55s
Windows Release Master Gold x64 (msvc)	9m 22s
Alpine Release x86 (gcc)	1s
Windows Release Master Gold x86 (msvc)	8m 22s
Fedora Debug x86_64 (gcc)	1s
Fedora Release x86_64 (gcc)	1s
macOS Debug x86_64 (clang)	8m 34s
macOS Release x86_64 (clang)	10m 13s
macOS Debug arm64 (clang)	4m 18s
macOS Release arm64 (clang)	6m 15s
	1h 32m 51s

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