Add ability to deep scan directories

[tduffield]

Current State

License Scout will only scan the specific directories you give it. This requires that the individual/system scanning the directory must have a pre-built list of directories that contain the necessary files.

Desired State

Via an optional flag, directory License Scout to recursively scan all nested subdirectories of the root directory it is given.

The final report should provide a complete accounting of all dependencies it finds, with the understanding it might contain dependencies of vendored content.