Add ability to select and amend options for multiple layers at once.

Idea created by cordingleyb on Dec 22, 2014
    When working with data or layers in desktop or AGOL it would increase productivity if you could amend the layer options of more than one layer at once. For example, in ArcGIS online I want to select numerous layers and set up the pop up for all of them at once.
    This same functionality could be added to all aspects of each product line, saving a lot of time wasted on repetition. Another example would be in Desktop, I should be able to select three of five layers and set up labeling for all three at once.