Use template instantiation for friend declaration
Fix constness of operator[]
Add missing Url.h include
Use template cast
Fix constness of Proxy
Fix include path
Make fromStartup compile on mac
#ifdef unneeded sys/prctl.h include in the mac build
Rename millisecondsSinceStartup to monotonicCurrentTimeInSeconds
Wrap hiResCounterHandler in a function to prevent an order of initialization problems
monotonicCurrentTimeInSeconds should return seconds, not milliseconds
RelativeTime tidying