Automatic delay/timeout handling in interactions

If you e.g. play a sequence in an interaction, and want to delay subsequent commands (do_transition, monologue etc), you need to calculate the correct timeout parameter by hand for interactions.json.

The play_sequence function in kiigame.js generously returns the sequence delay; perhaps it could be used in handle_commands.

Start by reading play_sequence and handle_commands in kiigame.js, then inspect how timeout values are represented in interactions.json. Trace how a sequence delay should affect subsequent commands such as do_transition and monologue. Done means callers no longer need to calculate the correct timeout manually for delays returned by play_sequence.

Written by the indexing model from the issue text.