No initialization is needed anymore and we can use the logging functions
safely at any point of the code (threading is not handled though, so you
might get multiplexed messages if you log from two threads
simultaneously).
Move the implementation of the more specialized methods to the base
class and let the platform implement only the most generic method that
takes all the possible arguments.
These specialized methods will then map to the generic implementation
that must be provided by the platforms we support.
