src/scene_util.js: refactor Magi.Text, workaround for Chrome returning 0 for image.width, reverse wheel zoom
src/scene_util.js: refactor Magi.Text, workaround for Chrome returning 0 for image.width, reverse wheel zoom

juanpiwi/magi,juanpiwi/magi,juanpiwi/magi,kig/magi,kig/magi,kig/magi,juanpiwi/magi