Add support for multiple files to Source

[jackrobison]

No description provided.

[jackrobison]

Cases to handle:

• stream contains a single file
• stream contains a directory containing a single file
• stream contains a directory containing a single file with the content and readme like text file
• stream contains a directory containing a single file with the main content and one or multiple auxiliary files (example: subtitles)
• stream contains one of the above cases and a small quality sample file
• stream contains a series of sequential files (ep1, ep2, etc)
• stream contains a compressed archive (maybe password encrypted)
• stream contains a directory of rar chunks
• stream contains a directory containing nested layers of the above examples

[jackrobison]

A related issue is that currently there can be only one supported language - subtitle files complicate this.