Moved core files from libs directory to src

src/core/tmtr.h

src/core/tnoofont.cpp

src/core/tnoofont.h

src/core/tnootkaqml.cpp

src/core/tnootkaqml.h

src/core/tpath.cpp

src/core/tpath.h

src/core/translationHeader.h

src/core/tscoreparams.h

src/libs/core/changes

src/libs/core/fonts

src/libs/core/gpl

src/libs/core/minizip/tzip.cpp

src/libs/core/minizip/zip.c

src/libs/core/mobile

src/libs/core/picts