Use lazy logging for non-constant strings

[MrBergin]

There's places in Cobalt (e.g. BaseProperty.onChange) that would benefit from switching to their lazy logging counterparts, e.g:

logger.debug("Subscribing to changes to property: $this.")

Should be

logger.debug { "Subscribing to changes to property: $this." }

I can't speak for the JVM implementation of uuid, but when looking at performance in the browser for Zircon I could see a fair chunk of time spent in uuid.toString() and garbage collecting strings which went away when using lazy logging and turning debug off.

[adam-arold]

Thanks, @MrBergin this is a great observation! I'm gonna ad this to the next release.

[Baret]

I just grepped for log\w+\.\w+\( in the whole project and there are only some logger.warn() calls left, so this issue seems to be fixed. Especially the aforementioned call(s) in BaseProperty are already changed.