Should we support third-party log methods

[taylortom]

• how

These won't fit into the standard module load process, as the log functions will be needed from the very start.

[taylortom]

Done, see https://github.com/adapt-security/adapt-authoring-logger/blob/master/lib/loggermodule.js#L155-L159

• log event
• cachedLogs for logs before app.onReady() is resolved