Remove doom-cleanup-hook & doom/cleanup-session

These weren't reliable, often times buggy or overzealous about killing
buffers and processes. Best to do it manually or come up with a better
solution.

modules/feature/evil/+commands.el

@@ -1,9 +1,5 @@
 ;;; feature/evil/+commands.el -*- lexical-binding: t; -*-
 
-(evil-define-command +evil:cleanup-session (bang)
-  (interactive "<!>")
-  (doom/cleanup-session bang))
-
 (evil-define-operator +evil:open-scratch-buffer (bang)
   (interactive "<!>")
   (doom/open-scratch-buffer bang))
@@ -94,7 +90,6 @@ This command understands vim file modifiers (like %:p:h). See
 (evil-ex-define-cmd "grevert"     #'git-gutter:revert-hunk)
 
 ;;; Dealing with buffers
-(evil-ex-define-cmd "clean[up]"   #'+evil:cleanup-session)
 (evil-ex-define-cmd "k[ill]"      #'doom/kill-this-buffer)
 (evil-ex-define-cmd "k[ill]all"   #'+default:kill-all-buffers)
 (evil-ex-define-cmd "k[ill]m"     #'+default:kill-matching-buffers)

modules/feature/workspaces/config.el

@@ -102,8 +102,6 @@ Uses `+workspaces-main' to determine the name of the main workspace."
 
   (advice-add #'persp-asave-on-exit :around #'+workspaces*autosave-real-buffers)
 
-  (add-hook 'doom-cleanup-hook #'+workspaces|cleanup-unassociated-buffers)
-
   ;; Ensure buffers we've opened/switched to are auto-added to the current
   ;; perspective
   (setq persp-add-buffer-on-find-file t

modules/lang/cc/config.el

@@ -210,7 +210,6 @@ compilation database is present in the project.")
     :definition #'rtags-find-symbol-at-point
     :references #'rtags-find-references-at-point)
 
-  (add-hook 'doom-cleanup-hook #'+cc|cleanup-rtags)
   (add-hook! 'kill-emacs-hook (ignore-errors (rtags-cancel-process)))
 
   ;; Use rtags-imenu instead of imenu/counsel-imenu

modules/ui/popup/config.el

@@ -56,7 +56,6 @@ adjustment.")
   :keymap +popup-mode-map
   (cond (+popup-mode
          (add-hook 'doom-escape-hook #'+popup|close-on-escape t)
-         (add-hook 'doom-cleanup-hook #'+popup|cleanup-rules)
          (setq +popup--old-display-buffer-alist display-buffer-alist
                display-buffer-alist +popup--display-buffer-alist
                window--sides-inhibit-check t)
@@ -64,7 +63,6 @@ adjustment.")
            (push (cons prop 'writable) window-persistent-parameters)))
         (t
          (remove-hook 'doom-escape-hook #'+popup|close-on-escape)
-         (remove-hook 'doom-cleanup-hook #'+popup|cleanup-rules)
          (setq display-buffer-alist +popup--old-display-buffer-alist
                window--sides-inhibit-check nil)
          (+popup|cleanup-rules)