Need more logging on pack load

[dlamkins]

The previous markers & paths module included a lot more log entries.

We don't necessarily need to be quite as verbose, but we should consider indicating:

• Parsing failures
• Load times
• What packs were loaded
• Texture counts

[dlamkins]

Specific details when there are parsing failures have been requested (ex. file names / line numbers). This all occurs within TmfLib, so a generic logger will need to be passed along or the errors will need to be provided in the response from its API.

The prior seems more appropriate.