Refactor Project API to reflect changes upstream

projectile-project-root no longer returns `default-directory` if not in
a project (it returns nil). As such, doom-project-* functions (and their
uses) have been refactored.

+ doom-project-p & doom-project-root are aliases for
  projectile-project-p & projectile-project-root.
+ doom-project-{p,root,name,expand} now has a DIR argument (for
  consistency, since projectile-project-name and
  projectile-project-expand do not).
+ The nocache parameter is no longer necessary, as projectile's caching
  behavior is now more sane.
+ Removed some projectile advice/hacks that are no longer necessary.
+ Updated unit tests

modules/lang/php/config.el

@@ -49,7 +49,8 @@
     (setq phpactor-working-dir
           (or phpactor-working-dir
               (php-project-get-root-dir)
-              (doom-project-root))))
+              (doom-project-root)
+              default-directory)))
   (advice-add #'phpactor-get-working-dir :before #'+php*project-root)
 
   (map! :map php-mode-map