Changes :

• Made building tests optionnal, CMake option ENABLE_TESTING
• Enabled precompiled headers on all platforms, CMake option ENABLE_PRECOMPILED_HEADER, refactored contribution from Kike GARCIA (VisualARQ) although they don't mention using this sdk ;-)
• Added options to create static libraries, CMake option STATIC_LIBRARIES
• Install Microsoft Visual debug information (pdb) in Debug mode
• Step::SPFReader and Step::SPFWriter now take [i|o]streams instead of filenames to read/write to, this enables wider range of reading/writing schemes (zip archives, streaming, etc.)
• Step::String corrections on the \X\ encoding
• Added a progress callback to Step::SPFReader and Step::SPFWriter
• Added virtual keyword to copy operator and non-const method