Add parameters to scripts

[benjie]

Commands are of the form ?command payload, where payload can be a long message containing arbitrary characters. This then finds the command that matches command and sends it 4 arguments: the user, channel, context and payload. For channels the context is the channel, for DMs the context is the user (and the channel is null).

channel and group messages

1. nick
2. channel name
3. channel name
4. payload

im messages (DMs)

1. nick
2. 'null'
3. nick
4. payload

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A good way to test it's working is to call the ?debug script