Packets/VectorParser: set length field before adding new values to the vector

Clean up all file-defines and remove all tabs

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

Packets: Add parse helpers for private fields
Packets: Rename all SENF_PARSE_ parse helpers to SENF_PARSER_
Packets/MPEGDVBBundle: Fix parsers to make use of the new parse helper features
Add additional Doxygen predefined macros to correctly parse the packet parse helper macros