kakoune: rework plugin support

The previous implementation of plugin-support for the kakoune derivation
was based on generating, at build time, a `plugins.kak` file that would
source all .kak files in the list of plugins, and wrap the `kak` binary
in a script that would add some command-line arguments so that this
file gets loaded on start-up. The main problem with this approach
is that the plugins' code get executed *after* the user's configuration
file is loaded, so effectively one cannot automatically activate/configure
these plugins.

The idiomatic way of loading plugins is ensuring they end up installed
somwhere under `share/kak/autoload`. Because plugins are already being
packaged to have their code in `share/kak/autoload/plugins/<name-of-plugin>`,
we can obtain a derivation that includes the plugins simply by doing a
`symlinkJoin` of `kakoune-unwrapped` and all the requested plugins.

For this to work, we need to fix two issues:

  1. By default, kakoune makes `share/kak/autoload` a symbolic link to
     `share/kak/rc`, which contains all builtin definitions. We need
     to patch this to put the symlink under `share/kak/autoload/rc`, so that
     the join works.

  2. By default kakoune expects the `autoload` directory to be in
     `../share/kak/autoload` relative to the location of the `kak` binary.
     We need to set the `KAKOUNE_RUNTIME` to point the symlinked
     share/kak for this to work.

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