Rename min/max filters for clarity

[Thibaut]

min and max were added in #954. The original implementation behaved as "min = limit a number to a minimum value" and "max = limit a number to a maximum value".

This makes sense in the context of Liquid, since a filter is generally interpreted as a verb/action, but is confusing in the context of programming languages in general, which tend to have min / max functions that return the minimum/maximum value passed as argument.

After realizing this, I flipped the behavior in 282d42f, before realizing that it's not that simple 😛

Given the confusion (I've asked multiple people and got different answers), I propose we rename the filters for clarity.

@nithinbekal @pushrax @davidcornu @fw42 @dylanahsmith thoughts?

[davidcornu]

Of all the discussed options I think at_most and at_least make the most sense.

[fw42]

Are we not concerned that this breaks backwards compatibility?

[Thibaut]

@fw42 this was added a few days ago. It hasn't been released yet.

[arafatkatze]

Yes, Thanks.
This seems better.

[nithinbekal]

👍 This seems much better.