Use Node script for filesystem operations

[delucis]

This PR replaces Patrick Delges’s filesys Java class with a custom Node script to be consumed via the 264.fs abstraction.

This removes the dependency on Java, which is becoming less and less common on modern machines, causing friction on install.

Because this approach relies on Node for Max and the node.script object, this change will drop support for Max 6 and Max 7, requiring Max 8 as the minimum supported version.