Add a Share Menu to the Analyzer

[alexclst]

People may want to share analyzer results. We should consider adding a Share menu to the analyzer. This can allow for basically the same options as the main view, but using text, json, and csv representations of the analysis. We’d also have the Print option as discussed in #47. The only options not directly relevant to the analyzer are the Link and Paste clipboard options.

This would necessitate moving the core analysis functions into something that can be used both for the existing view, and also download generation. It may be that we want to unify the share output functions too, so as to better handle both Share menus without too much code duplication.