Fixing issue #261 - failing compilation with specified controller build

Issue caused by libEmu not being built but required by libItkpixv2 and libRd53b through their dependence on the encoding base class. Moved the encoding base class and hit map generator to libUtil, which gets always built, removed the dependence of libItkpixv2 and libRd53b on libEmu and removed the testing file in libItkpixv2.