Migrate Goals system to the command handler

[brucepro]

The goals system predates the extensible command handler class, consider adding the goals into the commands and review each command.
Consider ways to inform the bot of what commands can be used. Maybe in the bot prefix every 5 prompts or so. Have to test this as it might be jarring if during a conversation the bot is reminded about GET URL and changes the subject to use the command.

[brucepro]

removed the goals system.