seq_next, seq_prev, and seq_goto events are all renamed, and maintain
legacy compatibility.
This PR also introduces new EventTransformer framework to shim events
based on name prefix.
MA-2221
Shim has been updated to handle currents builds of the android and iOS
apps which are not returning the correct semantics/events. Shim now
includes the seek event.
This PR addresses the following issues:
1) All requests return a 200 OK unless there is an authorization failure. This is deliberate in case the secret key is compromised.
2) Push all of the nasty logic necessary to generate compatible video events into the LMS instead of trying to do that mapping on the mobile devices.
3) Stop using the deprecated "action" field in the segment.io event. According to their support team this field should not be used anymore and is just around for backwards compatibility reasons.
Fixes: AN-3818
