Make rules more generic

[kristinapathak]

Rules are used to determine whether or not to parse the device id from the source or destination of the wrp. If the device id should be parsed from the destination, the rule should have a regular expression stating how to parse the destination. As long as that isn't empty, the destination should be used to get the device id for events following that rule. For any events with rules not specifying a regular expression or events that don't have a rule, the source should be used.

[kristinapathak]

We want to be able to:

• parse against any field to determine the type
• rule should include the location and regex for parsing the device id

[kristinapathak]

We need to revisit what we want to do with this, given we won't need to parse the device ID anymore. We still probably want to only keep the payload on certain types of messages, and possibly keep the different TTL options.