Make btQuickprof thread safe
Add option in btQuickprof to override custom timing profile (btSetCustomEnterProfileZoneFunc, btSetCustomLeaveProfileZoneFunc)
remove b3Printf in a user/physics thread (those added added, while drawing the GUI running in the main thread)
When running the Example Browser with Basic Example, 'visual leak detector' show no leak.
Many other individual examples still leak, so it is work-in-progress.
Disabled the profiler window (too many leaks)