- made an extra zstd.mak file
- removed Format7zZStd
- SFXSetup also has zstd now
- the big 7z.dll is backward compatible to: 0.5 .. 0.7
- the small 7za.dll has only support for zstd 0.8
- update to 0.7.3
- GUI improvements:
- ZStandard Version and Level is shown in FileManager
- method and level selection is better
- this 7-Zip Version defaults to ZSandard now