4042 - Add ruler for terrain grid

In latest update you received ability to see actual size of object by using resolution grid above it

It is veryyyyyy useful, thank you for that

Buuut - sometime you need to count the size of object in pixels (in my case those pixels will become Minecraft blocks, so i need give that info for builders to understand proportions)

It is quite annoying to count them by eye, maybe it would be cool to have ruler mode, that will allow you just press on grid tiles, mark two/or more points and show number of pixel distance between them

I understand that it is not minecraft community forum, but good example of that maybe Axiom mod with very comfortable implementation of ruler