Fix #9655: [Emscripten] install the correct files on install (#11934)

Co-authored-by: Stepan Dyatkovskiy (kaomoneus) <ml@dyatkovskiy.com>

Add: Install additional documentation files with the game

Also include it in Emscripten packages

Feature: [Actions / CMake] support for generic linux builds (#8641)

These bundles can be opened on any "modern" Linux machine with
a driver that SDL2 supports.

Machines needs at least glibc 2.15, which was released 10 years ago.
It is build with CentOS 7 as base, and only assumes the following
libraries are available on the system:
- libc
- libdl
- libgcc_s
- libpthread
- librt
- libstdc++

All other libraries the game depends on are bundled together with
the game, so users don't need any library installed to use this
bundle. The downside of course is that this increases the binary
size a bit: 30 MiB of libraries are in this bundle.

RPATH is used to make ld-linux find the folder libraries are
stored in; however, system libraries are always used before these,
in the assumption libraries on the user system are more up-to-date.

Using -DOPTION_PACKAGE_DEPENDENCIES=ON switches on packaging
of libraries in the "lib" folder. This requires CMake 3.16 to
be installed; otherwise it will fail.

Fix: support non-ubuntu/debian Linux variants with LSB support (#8408)

This now generates a warning, as we would still like people to
make a Pull Request to support the target. But it does continue
with packing to a txz.

Fix: [bundle] postfix the architecture for Mac OS bundles

This in preparation for other architectures, like arm64.

Fix: [bundle] custom launch.sh is no longer required for Mac OS

Co-authored-by: Owen Rudge <owen@owenrudge.net>

Fix: make reproducible by not embedding timestamps

By default gzip embeds a timestamps which makes building it twice
not reproducible, passing -n skips this embedding behaviour.

Motivation: https://reproducible-builds.org

Add: create bundles via CPack

CPack works closely together with CMake to do the right thing in
terms of bundling (called 'package'). This generates all the
packaging we need, and some more.