Publishable Map/Graph Image Download

[WilliamsTravis]

Why this feature is necessary:
reView is able to make many useful maps and graphs quickly and it is possible to download these images. However, these are not quite high enough quality for publishing and they contain branding. This feature will apply a set of higher quality graphing/mapping methods to the currently selected dataset and return a high resolution PNG ready for publishing.

[ppinchuk]

We should also try to include a PDF export (if possible), since vector graphics are often preferred over PNG's.

[WilliamsTravis]

Mike has built a set of CLI commands that approach this request. Now, we just need to link these new methods with the user inputs from the GUI and add a button.