feat(update): support global update (-g) and improve help #63

Job	Run time
Standalone Package Export Check	59s
Static Analysis	58s
Build (gcc)	1m 12s
Valgrind Checks	1m 8s
Configuration Coverage	1m 7s
Runtime Smoke Checks	1m 9s
Build (clang)	1m 15s
CLI Strict CI Summary	0s
	7m 48s

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