completion/selectrum -> completion/vertico, part 1

- Use `vertico` as default completion engine
- Drop `selectrum` and `selectrum-prescient` support

modules/completion/selectrum/TODO.org

@@ -31,21 +31,16 @@ case for why this should be an exception:
 - selectrum is slated to become the default completion module, which makes this
   less of an inconsistency, but I'm not sure about the performance slowdown in
   ~map!~ since that seems to be one of the main concerns.
-- ~embark~ like most packages in the selectrum cinematic universe can be
+- ~embark~ like most packages in the vertico cinematic universe can be
   installed independently, so if you find it sufficiently useful you could also
   have a stripped down version of the config in doom core that is just used for
   on-buffer actions.
-** TODO Consider dropping prescient flag
-The only advantage over orderless is frecency over recency, without the better
-integration orderless has with built in emacs completion. A compromise might be
-to have ~+prescient~ just add prescient sorting, but it's probably not worth the
-maintenance burden.
 ** TODO =SPC s s= and =SPC s S= ~:sw~ ?
-There isn't really a selectrum analogue to ~swiper-isearch~, ~consult-isearch~
+There isn't really a vertico/consult analogue to ~swiper-isearch~, ~consult-isearch~
 does something else (give you previously used isearch search terms). Bound to
 regular isearch for now.
 ** TODO =SPC s B=
-Selectrum/Consult don't have a ~swiper-all~ analogue either. Unbound for now.
+Vertico/Consult don't have a ~swiper-all~ analogue either. Unbound for now.
 ** TODO Orderless style dispatchers
 Currently the =!= style dispatcher is only as a prefix, due to the abundance of
 =!= final macros. In my opinion this is useful enough to break consistency.
@@ -73,37 +68,12 @@ naming is hard™. Best alternative I can think of is this:
 ;ivy           ;; a search engine for love and life
 compleseus     ;; a search engine with all the planks replaced
 #+end_src
-** TODO Consider dropping Selectrum in favor of Vertico:
-To this end there is currently a ~+vertico~ flag to try it out, weird naming
-aside. I want to do this for a few reasons:
-*** Selectrum is more buggy
-Selectrum has a few longstanding bugs that don't exist in Vertico, namely: [[https://github.com/raxod502/selectrum/issues/491][491]]
-and [[https://github.com/raxod502/selectrum/issues/561][561]], as well as having worse handling when having lines of varying height
-(important for good icon support).
-*** Feature Comparison
-- Minad, Vertico's author, provides a detailed comparison [[https://github.com/hlissner/doom-emacs/pull/4664#issuecomment-871524782][here]]. I will note
-  however that I was seriously considering the switch before he wrote this
-  comparison due to the frustration of dealing with the rough edges.
-- Vertico doesn't support prescient, but I want to drop it anyway.
-- The [[https://github.com/raxod502/selectrum#vertico][feature comparison]] in the selectrum readme has been updated to better
-  reflect the current state of affairs. Both Vertico and Selectrum have some
-  features that the other package lacks. In my mind Vertico's features are more
-  useful, but the feature difference is small enough for it to be less important
-  than the bugginess imo.
-*** Vertico is more actively maintained
-This might be a temporary concern, but still.
-** TODO Icon support
-The icon support works well enough when using Vertico, but is a bit dodgy on
-Selectrum due to it not handling lines of varying height that well, which ends
-up causing the selection to slide off the screen when moving it the to the
-bottom in some cases. Hopefully we just use Vertico and this becomes a nonissue,
-but it should still be taken into account.
 
 * PROJ HACKs to be addressed
 ** TODO ~fboundp~ issues
 Even if the =ivy= module isn't loaded, it's packages can still get loaded by
 other means, such as =lispy= requiring =counsel=. This means that the ~fboundp~
-logic [[file:~/.emacs.d/modules/config/default/autoload/text.el::(cond ((fboundp 'consult-yank-pop) #'consult-yank-pop) ;;HACK see @ymarco's comment on #5013 and TODO.org][here]] (and formerly [[file:~/.emacs.d/core/autoload/projects.el::(and (bound-and-true-p ivy-mode][here]]) won't work unless the selectrum option is checked
+logic [[file:~/.emacs.d/modules/config/default/autoload/text.el::(cond ((fboundp 'consult-yank-pop) #'consult-yank-pop) ;;HACK see @ymarco's comment on #5013 and TODO.org][here]] (and formerly [[file:~/.emacs.d/core/autoload/projects.el::(and (bound-and-true-p ivy-mode][here]]) won't work unless the vertico option is checked
 first, which is what we do for now.
 ** TODO ~projectile-switch-project-action~ definition
 Without [[file:~/.emacs.d/modules/ui/workspaces/config.el::;; HACK?? needs review][this]] change new projects don't get opened in a new tab, but the exact
@@ -122,7 +92,7 @@ the other one. This can be reproduces on emacs -Q.
 This is due to orderless adding a bunch of other matches.
 
 * PROJ Review non-blocking Issues
-** TODO Profile selectrum =SPC /= vs ivy =SPC /=
+** TODO Profile vertico =SPC /= vs ivy =SPC /=
 Check if there are other places where optimisations can be made. Perhaps the
 ~command-input-async~ variables can tolorate lower values.
 ** TODO ~(defadvice! +orderless-match-with-one-face..~ causes lexical error
@@ -130,17 +100,8 @@ Probably caused by some doomism
 
 https://github.com/oantolin/orderless/issues/41
 
-* PROJ Upstream Issues
-** TODO Selectrum separators cause size calculation bug
-https://github.com/raxod502/selectrum/issues/491
-** TODO ~selectrum-repeat~ doesn't scroll to previously selected candidate
-Unlike Ivy, ~selectrum-repeat~ doesn't restore the position of the selection in
-the completion buffer. Seems to be reproduced in ~emacs -Q~. If so, create
-upstream selectrum issue.
-** TODO Marginalia annotations sometimes disappear on ~find-file~
-https://github.com/raxod502/selectrum/issues/561
-
 * PROJ Extra credit
+** ~vertico-repeat~ doesn't reselect the candidate
 ** TODO =bibtex-actions= improvements?
 Currently =SPC n b= is bound to a function, but =bibtex-actions= doesn't have a
 main dispatch function like =ivy-bibtex=, rather it has a bunch of different