Rename df::program_options_lite as ProgramOptionsLite

...ce/App/BitstreamExtractorApp/BitstreamExtractorAppCfg.cpp

source/App/BitstreamExtractorApp/bitstreamextractormain.cpp

source/App/DecoderApp/DecAppCfg.cpp

source/App/DecoderApp/decmain.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/App/EncoderApp/encmain.cpp

source/App/SEIFilmGrainApp/SEIFilmGrainAppCfg.cpp

source/App/SEIFilmGrainApp/SEIFilmGrainMain.cpp

source/App/SEIRemovalApp/SEIRemovalAppCfg.cpp

source/App/SEIRemovalApp/seiremovalmain.cpp

source/App/StreamMergeApp/StreamMergeAppCfg.cpp

source/App/SubpicMergeApp/SubpicMergeMain.cpp

source/Lib/CommonLib/CacheModel.cpp

source/Lib/Utilities/program_options_lite.cpp

source/Lib/Utilities/program_options_lite.h