Implement subscription #123

Job	Run time
Code Linting / Format / Lint	8s
macOS / Build (debug, homebrew (qt5), macos-11)	2m 14s
macOS / Build (debug, homebrew (qt6), macos-11)	5m 26s
Linux / deb (release, Qt 5, ubuntu-20.04)	1m 33s
Linux / deb (release, Qt 6, ubuntu-22.04)	3m 29s
Linux / deb (release, Qt 6, ubuntu:23.04)	5m 42s
Linux / rpm (release, Qt 6, fedora:37)	5m 52s
Linux / rpm (release, Qt 6, opensuse/leap:15)	6m 22s
Linux / AppImage (release, Qt 5.15.2, ubuntu:20.04)	3m 3s
Linux / AppImage (release, Qt 6.4.3, ubuntu:20.04)	6m 0s
Linux / snap	7m 34s
macOS / dmg (release, Qt 5.15.2, macos-11)	2m 0s
macOS / dmg (release, Qt 6.5.2, macos-11)	8m 29s
Windows / Build (x64, release, Qt 5.15.2, windows-2019)	1m 24s
Windows / Build (x86, release, Qt 5.15.2, windows-2019)	2m 1s
Windows / Build (x64, release, Qt 6.4.3, windows-2019)	5m 24s
Windows / Unified x64-x86 Installer	0s
	1h 6m 41s

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