- some documentation updates, once again

doclib: Introduce an intermediate doxygen-compatible image map format
Update all image maps to the new format

Packets/DefaultBundle/extra_tests: use unittest include from utils /grrr
Socket/Protocols/AddressExceptions: fixes
Socket: fixed documentation

Socket/Protocols: Move incorrectly placed members from AddressableBSDSocketProtocol to BSDSocketProtocol
Socket/Protocols: Add missing DatagramSocketProtocol to some protocols
Socket/Protocols: Extend documentation of addressing classes

Changed all exceptions to inherit from senf::Exception
Replaced all throwErrno() calls with throw SystemException()

Examples/Sniffer: Dump all packet registries before starting the packet capture

PPI: Add missing unit-test for typed connectors and fix typed connectors implementation
Socket: Remove left-over log message