search.go & search.html: add data export functionality for X and A pins

As prompted by network blue and feedback from teachers, it would be useful to be able to export X and A pin data on vidgrind as CSV. Students could then import the data into excel and perform analysis. We will need to develop code to get X and A pin data on vidgrind, but as an interim solution, we will use the “data” request offered by netreceiver. As the netreceiver data handler can only retrieve data in 60 hour segments, we will need to perform multiple queries and concat the data for periods longer than 60 hours.

In terms of the front end, an export button will appear when pins of type X and A are selected. Clicking this will prepare the CSV file and download when ready.

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