Changed HighsTaskExecutor to explicitly handle reference counting to … #13

Job	Run time
debug_all_tests (macos-latest)	6m 23s
debug (macos-latest)	5m 40s
debug64 (macos-latest)	6m 56s
debug64_all_tests (macos-latest)	6m 25s
release (macos-latest)	6m 12s
release_all_tests (macos-latest)	11m 54s
Release64 (macos-latest)	7m 17s
Release64_all_tests (macos-latest)	7m 37s
	58m 24s

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