JVET-N0329: IBC Search Improvement

source/Lib/CommonLib/IbcHashMap.cpp

source/Lib/CommonLib/IbcHashMap.h

source/Lib/CommonLib/MotionInfo.h

source/Lib/CommonLib/RdCost.h

source/Lib/CommonLib/Slice.h

source/Lib/CommonLib/TypeDef.h

source/Lib/CommonLib/UnitTools.cpp

source/Lib/CommonLib/UnitTools.h

source/Lib/EncoderLib/EncCu.cpp

source/Lib/EncoderLib/EncModeCtrl.cpp

source/Lib/EncoderLib/EncSlice.cpp

source/Lib/EncoderLib/InterSearch.cpp

source/Lib/EncoderLib/InterSearch.h

source/Lib/EncoderLib/IntraSearch.cpp