Merge pull request #1679 from ephiepark/dev

Restructure the source files

diff --cc build/VS2010/libzstd-dll/libzstd-dll.vcxproj
Simple merge

diff --cc build/VS2010/libzstd/libzstd.vcxproj
Simple merge

diff --cc build/cmake/lib/CMakeLists.txt
Simple merge

diff --cc lib/compress/zstd_compress.c
Simple merge

diff --cc lib/compress/zstd_compress_internal.h
Simple merge