src/{ui,components}.js: add 'Line' component, put drawLine() function there.
src/{intro,components}.js: Draw border around intro video.
src/co{mpone,nsta}nts.js: Make it scale better with BASE_SIZE.
src/{game,constants,components}.js: Put reads in foreground on drag.
src/{game,intro,simulate}.js: correct naming to Javascript-style camelCase.
src/{game,constants}.js: Separate MAIN and BANK panels.