Move update checks and directories to jamulus.app #5842

Job	Run time
Build vars & Github release (if required)	12s
Build for Linux .deb amd64 (artifacts+codeQL)	7m 18s
Build for MacOS (artifacts)	5m 55s
Build for Windows (artifact+codeQL)	24m 21s
Build for MacOS Legacy (artifacts+CodeQL)	18m 35s
Build for Android .apk (artifact+codeQL)	34m 46s
Create files for .deb repository (if requested)	0s
	1h 31m 7s

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