Merge branch 'master' of github.com:tihmstar/img4tool into master

switched to using GITHUB_ENV

Update README.md

build libplist with -fPIC

bump libgeneral to version 32

fix up hardcoded sizes

fix issue introduced by recent commit where not compressed payloads w…

…ouldn't be appended to im4p

Merge remote-tracking branch 'refs/remotes/origin/master'

Merge pull request tihmstar#45 from 0x9fff00/patch-2

Update libplist name for 2.2.0

fixed IGN of elements which do not have explicit Trusted=YES in plist