Bumps Icon Cutter to v4.0.0 (tgstation#86131)

## About The Pull Request

Exposes the rewind byond var, one guy had a problem with this and I had
flashbacks to manually setting repeat info on airlock animations and
decided to do the right thing.

Adds support for multiple target input folders by space separating them.
This should hopefully make integrating the cutter easier for downsteams
and servers with weird fucked up icon stuff.

This is a major release because I am being anal about SemVer and
TECHNICALLY I'm removing an unused (and unchanged) public version
constant

Also the input change is maybe sorta breaking so might as well

For more detail please see
https://github.com/spacestation13/hypnagogic/releases/tag/v4.0.0

dependencies.sh

@@ -31,4 +31,4 @@ export DREAMLUAU_VERSION=0.1.1
 export CUTTER_REPO=spacestation13/hypnagogic
 
 #hypnagogic git tag
-export CUTTER_VERSION=v3.1.0
+export CUTTER_VERSION=v4.0.0