Reading of SFZ improved: loop_mode=no_loop, fixes #21 #27

# to view logs

Job	Run time
Test / Create Swift Test Matrix	2s
Test / xcodebuild test (ios, swift 5.5)	1m 12s
Test / xcodebuild test (ios, swift 5.6)	1m 25s
Test / swift test (macos, swift 5.5)	1m 20s
Test / swift test (macos, swift 5.6)	1m 20s
Test / xcodebuild test (tvos, swift 5.5)	2m 34s
Test / xcodebuild test (tvos, swift 5.6)	2m 56s
Send Notification	0s
	10m 49s

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