proof_of_work 1.0.0-alpha3

Third alpha release of Proof of Work. There is no separate alpha2 release; its changes are included here.

Added

• Settings form: the settings of a challenge are only shown when it is enabled, and are loaded with AJAX when the checkbox changes. Settings of disabled challenges are no longer validated.

Changed

• Shape matching: options are checkboxes instead of radio buttons. Arrow keys no longer select an option; use Tab to move and Space to choose.
• Shape matching: a chosen shape is fixed and can no longer be unchecked; use Start over to begin again.
• Shape matching: the options row is centered on its own and may be wider than the row of shapes to match.
• Shape matching: the Start over and Continue buttons are styled, including hover, focus and dark mode.

Fixed

• Shape matching: the layout no longer jumps when the first shape is chosen. The row for chosen shapes is reserved in advance and lines up with the shapes to match, which are centered.
• Waiting time: the progress bar finishes one second before the waiting time, to make up for the stylesheet loading late. The continue link is only shown once the bar is full.

This is an alpha release: APIs and configuration may still change. Feedback in the issue queue is welcome.