Merge pull request #651 from paulkaplan/no-invisible-components

src/components/gui/gui.jsx

src/components/library/library.jsx

src/components/modal/modal.jsx

src/components/prompt/prompt.jsx

src/components/record-modal/record-modal.jsx

src/components/target-pane/target-pane.jsx

src/containers/backdrop-library.jsx

src/containers/costume-library.jsx

src/containers/record-modal.jsx

src/containers/sound-library.jsx

src/containers/sprite-library.jsx