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/tools/prodigy/autoload.el

@@ -44,7 +44,7 @@
 (defun +prodigy*services (orig-fn &rest args)
   "Adds a new :project property to prodigy services, which hides the service
 unless invoked from the relevant project."
-  (let ((project-root (downcase (doom-project-root)))
+  (let ((project-root (downcase (or (doom-project-root) default-directory)))
         (services (apply orig-fn args)))
     (if current-prefix-arg
         services