Skeleton POST implementation
Let the edn reader skip stuff it does not understand and permit POSTs to upload traces for arbitrary games.
Update to support new trace posting format. Also support loading arbitrary JS files in resources/public/js/ via the vis= query parameter.
Tentative puzzlescript state vis: show last selected inputs.
(very slowly) draw the last stages of all selected trace ranges
Better layout. Ignore undo and restart for split mode.
Visualize sequence of moves within selection. Still pretty slow, but also shows a timeline for reference.
Incremental drawing for puzzlescript and bug fixes for sequence visualization