Allow multi-select parameter modification

[ghramsey]

Could it be possible to select multiple entities of a given type and add a single parameter and value to all?

For example the animations there are three type CAGEanimation, PlayEnvironmentAnimation and CMD_Animation.

I've been manually adding a playspeed, play_speed, or PlaySpeed parameter to each and a value which is extremely tedious and time consuming especially then the entity list shows several types mixed in alphabetically.
I've spent three days manually adding the appropriate parameter to each and I have another day or two at this rate.

If I could have selected all the CAGEanimation and added playspeed = 5 to the lot it would have sped things up enormously.

Searching is already implemented just need a way to select more tha one item. Maybe apply this functionality to only animations for now.

[MattFiler]

Note to self: could achieve this if the user has entity tabs enabled