App: Allow batch edit for 1 or more items

[joselcvarela]

Purpose

Allow edit a single item without leaving the collection view.
This is useful when you do not want to leave the view you are on in the moment.

In one hand making changes should be quicker since you don't need to load the item and relationships when you already know what changes need to be made for that item.
On the other hand, you can keep track of the changes you are doing, i.e. you can make changes on single view, instead of going forward and backwards.