Test on mobile

[jkomoros]

• [x] And on Firefox and desktop safari
• [x] Safari: SVG renders clipped at beginning... until run changes via animation only
• [x] frame-vizualization should get its height/width set in some way based on available size (at the same aspect ratio as width/height)
• [x] Make configuartionExpanded by a proeprty in state (not just implied in the DOM of the configuration-controls), and when it changes, call resizeVisualization()
• [x] When configuration_expanded is true, offset with a margin (it's still possible for it to overlap)
• [x] When screen size is very small and config is not open, and the width overlaps with the collapsed controls, give a margin-top to frame visualization to not overlap it (could currently happen on very small phone screens)
• [x] Don't show the fork me on github on moblie (?)
• [x] Padding should be percentage of overall width
• [x] When screen size is very small, do a margin-left as well (since it overlaps even if it's closed)
• [ ] Add a rotate phone overlay (like card-web) if the phone is rotated differently than the aspect ratio of the visualization
• [x] Help icon on firefox/safari is highlighted
• [ ] Hide the fork on github on mobile screens
• [x] Make sure that the screenshotting machinery outputs frames at the exact pixel size and height (and document that that's what that means)
• [x] When controls.showing, page size, or width or height changes, recalculate a new scale for the SVG (verify screenshotting still works at expected width/height size of screenshot)
• [x] SVG should set a viewbox based on width and height so it sizes appropriately as container is scaled proportionately
• [x] Safari: SVG rendering of selected vs not selected project doesn't work (svg filter?)