build: use ubuntu 20.04 instead of 22.04

fix: disable symlink on windows

impr: add ipaddr to the bundle

refactor: fix sign-compare warnings

fix: ssize_t on windows

refactor: partial amalgamation support

feat: single-file bundle (nalgeon#82)

build: text - macos builds

fix: crypto - base85 encoding zero-termination char

fix: crypto - invalid free