enforce brace placement in Address
enforce brace placement in various new classes
enforce brace placement in xDYMO
enforce brace placement in GPSR
enforce brace placement in IPv4 hook code
enforce brace placement in IPv6 hooks code
const fixes (in OMNeT++ 5.0, check_and_cast<> no longer silently discards const modifier)

TODO maybe introduce a check_and_const_cast<> macro as shortcut for
const_cast<T*>(check_and_cast<const T*>(p)) ?
ARP: gates revised