Draft: Resolve "BEC Console: missing signal for prompt, and to catch output of commands"
Description
Prompt detection: given a list of tokens to represent the shell prompt, 1 "prompt" signal is added to inform when execution reaches prompt. This is done via text analysis, since the BECConsole widget itself has no idea what it executes. So, this solution is flexible to multiple kind of prompts...
Output capture: WIP
Closes #410