Bundle everything using "chroot" and "unshare"

Hi,

I wanted to give AppImage a try to create a "RawTherapee 5.1" package - which due to its dependencies is not available for even some recent distributions (like RHEL / CentOS 7.x).

I followed the "Documentation" link on https://appimage.org/, which led me to https://github.com/probonopd/AppImageKit/blob/master/README.md

I read there about LibcWrapGenerator, which I intended to try since it's easy to compile RawTherapee 5.1 on Arch, but it is a terrible pain to try this on CentOS.

Then I noticed that LibcWrapGenerator is not included (or used or mentioned) in the source code that is referred to by the "Source" link on the https://appimage.org/ page - which links to https://github.com/AppImage/AppImageKit instead of the other branch linked above, and both seem to contain pretty different content, with no clear explanation whether one or the other is outdated, and what happened to LibcWrapGenerator in the more recently changed of these two branches.

I also noticed that the "build.sh" script included with AppImageKit does create binaries under build/ - but there is no word on whether those should be installed somehow (if only by copying them to /usr/local/bin/ or something).

Can you clarify this confusion?