Add option to replace multiple models with a new model

[deplanche]

Currently there is an option to replace a model with this model, which is useful when someone makes an incorrect model, and sequences on it, and then wants to replace the model with a corrected model. Many times, the incorrect model was either downloaded from a vendor or was copied and pasted to multiple locations on the layout during the initial setup. In order to replace multiple incorrect models, the user has to make multiple copies of the good model, and replace each incorrect model one by one. Would be nice if there were an option to replace the multiple incorrect models with the single corrected model.

[artwait]

I'd find this very useful--I frequently tweak custom models and would like to easily update multiple copies across my layout.