this adds `hilbish.opts`, a table to set
simple options akin to shopt or setopt on
other shells. this commit specifically also
includes the autocd opt, which functions the
way you expect it to
to set opts, simply do `hilbish.opts.name = val`,
where `name` is the opt you want to set and `val`
being the opt setting.
ie: `hilbish.opts.autocd = true` to turn on autocd
basically, i have a `c` alias which is `git commit`,
this would resolve to `git commit` literally to try
and complete `commit`, which wouldnt match.
this fixes that, and instead itll suggest commands
that start with `c`. if there is a space after and
completion is requested, itll use the alias properly
prelude is no longer. it is now nature.
organized the single file prelude into multiple
source files and renamed it to nature. this is coming
after thought that it can turn into a general hilbish
lua core, with user facing modules as well.
this introduces the `nature.dirs` module, to interact
and get recently changed to directories and last/old
cwd.