src/{lib,game,components,simulate}.js: Properly shim console object.
src/{ui,game,components}.js: Set appropriate cursor styles.
Simplify naming of Z level constants.
src/{constants,components}.js: Add Popup component.
src/{ui,constants}.js: Add glossary, make it popup on clicking a term.
src/{ui,lib,components}.js: Add popup title, make text wrap.
src/constants.js: Insert Theodora's glossary text.
src/*.js: JSHint fixes.
src/ui.js: Prevent overlapping popups.