Multi-add

Simple idea here, it would be a huge time saver to let us add multiple items both from the workshop into a world, as well as from the workshop+a world into an inventory. For example, my solder needs to be equipped with the gear I've made one at a time, which is a lot of clicking and scrolling to the same place over and over again (his gear was made first, so it's all the way at the bottom. This could also be partially alleviated by a previous post's request for folders or the ability to name and organize items.)