+ Added a filtered set that accepts items only if a predicate does
* Moved LogLevel out of LogEvent
* Reordered arguments in ILogger so that varargs are used when using Throwables
* Changed from instantiating ParameterizedMessage from just using it statically
- Removed all methods that use the Marker class from ILogger
- Removed is*Enabled() methods from ILogger
- Removed regions from SLF4JLogger, since IDEA was messing them up