Let me check if it works without this.

Edit: it does. 👍

@sighphyre Basically, what this does is it moves the instantiation logic into a separate runtime.

The Twig extension has to be instantiated to read the metadata (like functions and filters the extension provides), but it was also used to provide the implementation, which means that it had a dependency on a working Unleash object just to read the metadata to construct the template cache.

Now that implementation and metadata are separate, the cache can be dumped without actually needing a working Unleash instance, which is needed only at runtime.

This effectively makes it possible to dump the cache on a build system that does not have information about the Unleash server.