Clean up all file-defines and remove all tabs

PPI: Added/updated new connector documentation
Packets: Updated packet navigation documentation

Examples/RateStuffer: Use CloneSource module
Exmaples/RateStuffer: Implement using a RateStuffer subnet
PPI: Implement CloneSource
PPI: Add throttle()/unthrottle() to passive debug modules
PPI: Implement DiscardSink
PPI: Implement ThrottleBarrier
PPI: Implement missing unit tests
PPI: Complete the documentation
Scheduler: Improve ClockService performance and remove a race condition
Scheduler: Clean up Scheduler::process()
Utils: Make singleton::instance() protected by default and fix implementation
Remove private members from doxygen documentation

PPI: More documentation
PPI: Implement IdleEvent and ActiveFeeder
PPI: add Module::running() member
Scheduler: Remove MinTimeout (not needed with ClockService working)

Packets: Silence PacketRegistry warnings with final=1
Utils: Remove MicroTime
Scheduler: Sart implementing more reliable timing mechanism