Refactor build system to remove sub-library dependencies

Utils/Logger: Enhance non-formatted time format to show seconds since first log message

Utils/Logger: Add more consistent and flexible configuration options to SyslogUDPTarget and IOStreamTarget

Add '-Wl,-S' to default build options to hugely increase link performance

Utils/Daemon: Make argv() return 'char const **'

Clean up all file-defines and remove all tabs

Scheduler/Console: Add 'sys' directory
Scheduler: Implement EventManager and 'sys/scheduler/events' command

Utils/Logger: More consistently support optional stream spec

Scheduler: Documentation update

Scheduler: Move remaining non-public implementation classes into 'detail' namespace
Adjust rest of SENF accordingly

Scheduler: Clean up FIFORunner::TaskInfo interface
Update rest of senf to use the new API

Scheduler: Move task 'name' argument to constructor
Scheduler: Remove obsolete 'enabled_' members
Scheduler: Remove obsolete SchedulerTimer class

Scheduler: Fix FIFORunner exception safety
Scheduler: Implement new signal event API
Migrate SENF to use new signal API

Scheduler: Add automatic periodic resync to ClockService::abstime() and ClockService::clock()
Scheduler: Add task nameing
Scheduler: BUGFIX: Add missing task-dequeue in FdDispatcher::add()
Scheduler: Add empty() member to all dispatchers
Scheduler: Add eventTime() support to FdManager
Scheduler: Add support for non-pollable file descriptor detection to FdManager and FdDispatcher
Scheduler: Add FIFORunner task watchdog
Scheduler: Add debugging backtrace to FIFORunner
Scheduler: Change senf::Scheduler implementation to use the new dispatcher infrastructure
Scheduler: BUGFIX: Fix access to (possibly) destroyed object in TimerEvent::run()
Utils: Add senf::signalName() helper
Utils/Daemon: Use senf::signalName() in debug messages
Utils/Logger: Fix logger to correctly format the timestamp (the deadlock should be fixed now)
Update scheduler callback signatures to the new API throughout the project
Update documentation

Scheduler: Fix all 'throw SystemException' statments to use SENF_THROW_SYSTEM_EXCEPTION
Scheduler: Implement TimerDispatcher

senfscons: Speed up non-documentation builds (doesn't help much)
Socket/Protocols: Add documentation for sockaddr_cast

Utils/mpl.hh: Add SENF_MPL_SLOT_NOEXPAND support
Packets/ParseHelpers.doc: Add documentation about pretty-printing preprocessed code

Console: Rewrite parser semantic actions to use phoenix (much (cd ..) simpler ...)

Fix lot's of inline implementation ordering errors (make sure, all inline functions are implemented before first use)

Console: Implement LinkNode

Console: ConfigFile support

Utils: Replace TypeInfo demangle implementation from binutils with cxxabi implementation
Console: Implement Executor chroot and security policy support
Console: Refactor Node::traverse() implementaiton to move code out of template function

Scheduler: Make Scheduler more robust by ignoring closed file descriptors