Macro defined log messages

[hmartiro]

So that we can have debug/trace log messages that are included at compile time only when compiled in Debug mode. Right now, we can set the log level but having arguments of debug and trace messages evaluated slows down the system.

[hmartiro]

Perhaps something like

WARNING(logger << "my message");

to replace

logger.warning() << "my message";

where the macro expansion is something like

if(logger.level() >= log::Warning) {
    logger.warning() << "my message";
}

Might also be worth splitting off the logger into its own repository and making it header-only.