Track external dependencies

[Naros]

Description

The preload, instantiate scene, resource path, and dialogue message nodes all refer to a specific resource path that they use, and these should be tracked as external resources rather than attributes for the node.

Implementation ideas

As mentioned above, these nodes store a reference to the specific file path directly in the node's metadata. The issue with this approach is that this metadata is considered part of an internal resource, and therefore is not elgiible for dependency management.

Instead, these nodes should treat these file paths as external resources or dependency tracked items, so that when they're renamed in the filesystem dock, orchestration scripts will update and reflect the new path or filename automatically.