sqlean

fileio: fix unicode filenames on Windows by @MVV90

Added xxHash, a very fast non-cryptographic hash algorithm, to the crypto extension.

Changed the SHA2 implementation.

All extensions are now built with the -O3 optimization level.

⚠️ Renamed build artifacts:

• sqlean-linux-x86.zip → sqlean-linux-x64.zip
• sqlean-macos-x86.zip → sqlean-macos-x64.zip

⚠️ Dropp...

Made the time and uuid extensions compatible with Android.

Made the time and uuid extensions compatible with POSIX systems that don't have timespec_get but do have clock_gettime.

Nothing fancy, just some handy improvements and nice bug fixes:

• define: Disallow executing defined functions after calling define_free (#141)
• fileio: Fix buffer reallocation in fileio_scan (#149 by @alexk-195)
• [uuid](https://github.com/nalgeon/sqlean/blob...