river-classic (dynamic tiling Wayland compositor)

It is a fork of river 0.3 intended for users that are happy with how
river 0.3 works and do not wish to deal with the majorly breaking
changes planned for the river 0.4.0 release.

NOTE: This requires zig-0.16.0 to compile, but the other packages
I host (ghostty & ncdu) that use zig do not build on 0.16 and there
are no patches for them yet, so the zig SlackBuild will stay on 
0.15.2 until they work. Simply changing the $VERSION and building
a package will give you a working zig to compile river with.