fantasy telescope idea

use rti1w as a base

* [x] server waits for connection
* [x] client establishes connection
* [x] send a message to the client
* [x] move core rendering out of main.cpp
* [ ] combine 'hittable' 'hittable_list' and 'scene'
* [x] send rendered image data to client
* [x] form image file on client
* [ ] client sends receiving port to server
* [ ] client application sends command to send image
* [ ] server receives imaging command
* [ ] server renders image
* [ ] server sends image data stream to client
* [ ] client application receives image
* [ ] client requests resend of lost packets
* [ ] client displays image
* [ ] client saves image to file
* [ ] server sends telemetry to client (what telemetry?)
* [ ] server compresses image before sending to client
* [ ] client specifies image parameters