improve performance

[ismailshak]

TUI improvements:

• screen.go should be renamed to predictions.go
• build input and write to stdout efficiently
• when --watch, build the new screen before wiping the current stdout output

UX improvements:

• if a single argument fuzzy matched multiple stops (up to a limit), it should print multiple stops
• this should extend to N-args
• figure out a good limit
  • could be configurable (e.g. if a pi-controlled screen wants to print many things)
  • this might involve figuring out best performance to UX ratio (i.e. print all at once after gathering vs print as you collect)
  • might involve loading spinners (can have progress context since i know what the count of stops were)