Refactor build system to remove sub-library dependencies

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

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

Packets: BUGFIX: Fix init_bytes caculation on dynamic parser bitfields

Utils/Daemon: Last implementation fixes
Fix installation of some missing files

Make all include path's relative
Add 'senf/Packets.hh', 'senf/PPI.hh' and 'senf/Socket.hh'

Add missing cleanup files

Socket/Protocols: Removed obsolete GenericSockAddr
Utils: Add missing unit tests
Fix debian '.install' files

Packets: Fix parser-inheritance example
Packets: Change PacketRegistry 'Type' argument to be the ConcretePacket instantiation
Packets: Updated PacketRegistry documentation
Packets/DefaultBundle: Update to use new Packets.hh include

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added listen to ConnectedCommunicationPolicy
added primitive doxygen documentation
cleaned up naming of some files
fixed INetProtocol.cc (missing const modifiers)
removed SocketProtcolHelper in favor of directly inheriting SocketProtocol virtually
moved implementation of TCPv4SocketProtocol virtual methods into the base classes
added rudimentary testing of the TCPv4SocketHandle protocol interface
finalized PacketSocketHandle