replace filter

/\/\ I had almost built an entire computer before I realized that the activation modules in my memory cells wouldn't cut it. So I thought that it would be convenient to simply swap out the activation module memory buses with OR blocks. Not so simple. Completely undid all the memory connections...

Basically you could set the filter to remove ALL block types, except 1. So a player might choose NOT to remove rail turret axis, but to remove all other block types. Or perhaps it could be expanded further, and allow players to select multiple block types not to remove, ie, all rail types...