Scraper inputs

[WithoutPants]

Adds the following fields to the gallery json input passed to script scrapers:

• code
• photographer
• files

The files field is an array of objects with the following fields:

• id
• mod_time
• path
• size
• fingerprints (array of { type, value })

Adds the following fields to the scene json input passed to script scrapers:

• code
• director
• files

The files field is an array of objects with the same fields as in the gallery input, with the following additional fields:

• zip_file (optional object with file fields)
• format
• width
• height
• duration
• video_codec
• audio_codec
• frame_rate
• bitrate
• interactive
• interactive_speed

Folder information is deliberately omitted for now, as it requires a bit more work.

Resolves #1027
Resolves #1554