With previous import style, the `LOG_ASYNC_ENABLED, LOG_LEVEL_DEF`
macros were not being defined.
@import style module includes are handled differently in ObjC++, causing
problems with out millisecondTimeStamp implementation. Rather than
address that problem head on, I simple reimplemented our millisecond
timestamp method in objective-c, removing our single ObjC++ file.
// FREEBIE