Improve analytics models display and administration

This is a proposal to make the management and display of the list of analytics models easier to read and more informative. In this proposal, the current list of analytics models would be slightly simplified (removing the indicator display and truncating the width of the "insights" drop-down), and the ability to add, duplicate, edit, and delete models using one of several potential model editors (e.g. MDL-61806 or  MDL-62293) would be implemented. It would be possible to export, share, and import models, perhaps as xml or JSON files, including training data. This display would also highlight model training status and accuracy and usage calculations, to aid in evaluation of models.