Why does SafeLoggable not provide SafeArgs?

[uschi2000]

SafeLoggable returns Args, but should return SafeArgs?

https://github.com/palantir/safe-logging/blob/develop/safe-logging/src/main/java/com/palantir/logsafe/SafeLoggable.java#L28

[nziebart]

We actually want it to be able to return both kinds of args. Maybe we should rename the interface to LoggableException?