Remove symlinks and make codebase use common modules instead.

Rename files in order to prepare for extraction for publishing
subsystems independently.

Unify config loading in net and video subsystems.

Copy implementation from lws.

Ensure mounts are configurable.

Split callback logic into several functions.

Correctly dereference pointers.

Add third-party mocks, specify mock files.

/? Do we need first-party mocks in their own files, or can we provide a
mock flag in the implementation files already?

Make device handling opt-in.