Implement ASPEN in and out.

[sparkpunkd]

Implement in and out nodes that process the ASPEN RTP encapsulation of MPEG transport streams.

ASPEN is the initial focus. It should be possible to process other MPEG-TS encapsulations of media, such as SMPTE 2022-2, using the same codebase. These additional formats will be tracked as separate issues.

• [x] Unpack transport streams to PES stream payloads.
• [ ] Pack grain payloads as PES payloads into transport streams,
• [ ] Uncompressed mono-essence video streams. SMPTE RDD 37.
• [ ] Uncompressed audio streams - twit-biddling required. SMPTE ST 302.
• [ ] Ancillary data streams. SMPTE ST 2038.

[sparkpunkd]

Created separate module tesladon to provide generic, stream-based processing of MPEG-TS for node.js.