Analytics updates

[james-minton]

Would be nice to have events for the below:

• Type of report downloaded from map (PPT / PDF / XLSX)
• Data downloads from FTP page (On hold for how.)

[amygroshek]

@james-minton I've got a revision to #1234 waiting for PR, #1236. This will send the file types to both the unnamed Data Download event you've been using, and also create a separate event called "File Download," in the same category, that will just store the string of file types in the downloaded ZIP file. This custom report, once populated with some data, should show all 3 selected locations plus the file type combo in the download.