Help Page Buttons

[robmoffat]

HelpPage reference in *ChatHandlerMapping,

Also buttons with parameters?? where a button has parameters, we can't add it to the help menu.

• How can we override the help page?
• Do we want exclude, do we want to group things?

@Help annotation - that contains some of these things.

Can we have a demonstration in demo-bot of how to override the HelpController?

Also ServiceNow bot needs help ordering, so we should add something like this to @ChatRequest:

    int helpOrder()

Which is used by HelpController.

[robmoffat]

Related to #313