v28
Move generic util functions to shared directory
Fix includes after change to build-sys
Move array implementation to shared directory
Remove FSF mailing address
Move hash implementation to shared directory
shared: fix UNIQ definition
Move missing.h to shared directory
Add scratchbuf implementation
shared: make scratchbuf_str static
shared: rename prefixes of strbuf functions
add Zstandard compression support
util: use UINT64_MAX