GTK4 viewer for PPUB files

Billy Barrow 5528b4af7d Api change? %!s(int64=2) %!d(string=hai) anos
src 5528b4af7d Api change? %!s(int64=2) %!d(string=hai) anos
.gitignore e64fe53aa0 Initial commit %!s(int64=2) %!d(string=hai) anos