feat: add project-vc config

I intend to keep `project-vc-extra-root-markers` much lighter than what
`projectile-project-root-files` ended up being, so I won't be
transferring all the root markers.

Ref: doomemacs/core#1

lisp/doom-projects.el

@@ -23,8 +23,16 @@ debian, and derivatives). On most it's 'fd'.")
 ;;
 ;;; Packages
 
-(after! project
-  (setq project-list-file (file-name-concat doom-data-dir "projects")))
+(use-package! project
+  :defer t
+  :init
+  (setq project-list-file (file-name-concat doom-profile-state-dir "projects"))
+  :config
+  (add-to-list 'project-vc-extra-root-markers ".jj")
+
+  ;; TODO: Advice or add command for project-wide `find-sibling-file'.
+  )
+
 
 ;; DEPRECATED: Will be replaced with project.el
 (use-package! projectile

modules/lang/cc/config.el

@@ -303,6 +303,8 @@ If rtags or rdm aren't available, fail silently instead of throwing a breaking e
   :defer t
   :init
   (defvar ccls-sem-highlight-method 'font-lock)
+  (after! project
+    (add-to-list 'project-vc-ignores "^\\.ccls-cache$"))
   ;; DEPRECATED: Remove when projectile is replaced with project.el
   (after! projectile
     (add-to-list 'projectile-globally-ignored-directories "^.ccls-cache$")

modules/lang/gdscript/config.el

@@ -1,5 +1,8 @@
 ;;; lang/gdscript/config.el -*- lexical-binding: t; -*-
 
+(after! project
+  (add-to-list 'project-vc-extra-root-markers "project.godot"))
+
 ;; DEPRECATED: Remove when projectile is replaced with project.el
 (after! projectile
   (add-to-list 'projectile-project-root-files "project.godot"))