Stealth: Server needs support for 206 (Partial Content)

[cookiengineer]

The Stealth Webproxy and Webserver need support for 206 Partial Content requests, which would allow to serve content from the cache in the profile as streams (e.g. video and other large files).

• [x] If a request contains a bytes=start-end header, serve it from the cache while preserving the correctly expected payload.length.

• [x] Verify that stealth/packet/HTTP Parser integrates packet.headers['@transfer']['range'] correctly.

• [ ] Integrate 206 support into Webserver

• [x] Integrate 206 support into Webproxy

[cookiengineer]

As of https://github.com/tholian-network/stealth/commit/c8006cd449e594eefdb11227a62efbdcb43ab9cd this has been implemented.