Rename KFpack --> PackKeyFrame and related names...
KFpackPtr --> PackKeyFramePtr KFpackBuffer --> PackKeyFrameBuffer gtest_KF_pack_buffer.cpp --> gtest_pack_KF_buffer.cpp
KFpackPtr --> PackKeyFramePtr KFpackBuffer --> PackKeyFrameBuffer gtest_KF_pack_buffer.cpp --> gtest_pack_KF_buffer.cpp