RFC: Advanced timetable export interface

Our current export system is quite powerful because it uses a full Chromium instance to render the website. This means that it can actually support quite a lot more features than what we have now. This may be useful to expose to users since a common NUSMods use case is to export the timetable as image for printing or as a wallpaper.

Proposal:

Using a modal to contain additional options, we can offer users the ability to export their timetable in arbitrary size, optionally with padding around the edge. Implementation should be relatively easy -

• Add support for additional options to the export server
• Decide on how the additional options should be sent over (probably just added to the object)
• Implement the modal on www, with intelligent defaults to select the user's current screen size, and options for common screen / paper sizes

Start by tracing the current export flow through the export server and the www interface. Define how arbitrary dimensions, padding, screen sizes, and paper sizes are represented and passed, then confirm the modal uses sensible defaults and that the server produces the requested timetable output.