Reduce global access to `composition` in favor of references

WhitmanSWDesignSpring2018 / project-5-8-teamuno

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Reduce global access to `composition` in favor of references #59

Closed beszel closed 5 years ago

beszel commented 5 years ago

Tested and working. TuneComposer.composition is still global, but access to it has been made more explicit. Remaining global accesses are only in methods for which significant refactoring is needed, specifically in methods of Gesture.