Add an events summary table to the patrols workflow

[walljcg]

In addition to the pie chart and map summarizing patrol events, we should also display a table of the events. This would include the following columns:

1. serial number
2. event time
3. event type
4. event title
5. recorded by
6. other*

** columns could be controlled by a config parameter when generating the table (e.g., 'num_charcoal_kilns') and as long as those column(s) exist then they are pulled out of the additional event_details json and turned into a column.

The table should be scrollable and allow sorting on the different columns. Ideally, a 'download' button would let the user export a csv.

A quick-win is to start with the pandas.DataFrame.to_html() function. But eventually we probably need our own 'EcoTable' class to meet all these needs.