v4.2 release

New features/additions

• Allow getting a PDU's advertised size and use it in PacketWriter (#324)

• Add missing Dot11 tagged option types (#305)

• Add support for DLT_RAW (#313)

Fixes

• Updated location of installed CMake files in unix systems (#331)

• Fix check to detect cross compilation (#330)

• Install DLLs in right directory (#326)

• Fix potential invalid memory accesses when parsing RadioTap (#322)