Added handling SIGTERM signal for proper stopping dedicated server #2320

Job	Run time
flatpak (su.xash.Engine.Compat.i386)	3m 31s
build (ubuntu-20.04, linux, amd64)	41s
build (ubuntu-20.04, linux, i386)	51s
build (ubuntu-20.04, android, multiarch)	4m 36s
build (ubuntu-latest, nswitch, arm64)	1m 3s
build (ubuntu-latest, psvita, armv7hf)	2m 49s
build (windows-latest, win32, amd64)	2m 0s
build (windows-2019, win32, i386)	2m 26s
build (macos-14, apple, arm64)	51s
build (macos-12, apple, amd64)	1m 10s
Upload releases	0s
	19m 58s

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