Add undo/redo functionality and tests

src/components/sound-editor/icon--redo.svg

src/components/sound-editor/icon--undo.svg

src/components/sound-editor/sound-editor.css

src/components/sound-editor/sound-editor.jsx

src/containers/sound-editor.jsx

.../unit/components/__snapshots__/sound-editor.test.jsx.snap

test/unit/components/sound-editor.test.jsx

test/unit/containers/sound-editor.test.jsx