[decompiler] as-type and font method support (#3855)

Add support for `as-type` macro, and detecting inline font methods. This
works in all three games but I've only updated jak 3's goal_src for now.
Eventually I will go back and work through the others, but I want to get
more decompiler features in first.


![image](https://github.com/user-attachments/assets/5c31bf85-97b4-437c-bc4b-dc054e60551e)

---------

Co-authored-by: water111 <awaterford1111445@gmail.com>

test/decompiler/reference/jak2/engine/nav/nav-mesh_REF.gc

@@ -718,12 +718,7 @@
 ;; definition for method 45 of type nav-mesh
 (defmethod link-to-other-mesh ((this nav-mesh) (arg0 nav-mesh-link))
   (when (not (-> arg0 dest-mesh))
-    (let* ((s4-0 (entity-nav-mesh-by-aid (the-as actor-id (-> arg0 dest-mesh-id))))
-           (v1-1 (if (type? s4-0 entity-nav-mesh)
-                     s4-0
-                     )
-                 )
-           )
+    (let ((v1-1 (as-type (entity-nav-mesh-by-aid (the-as actor-id (-> arg0 dest-mesh-id))) entity-nav-mesh)))
       (when v1-1
         (let ((a0-3 (-> v1-1 nav-mesh))
               (v1-2 (the-as nav-mesh-link #f))
@@ -2600,12 +2595,7 @@
 ;; definition for function get-nav-mesh
 (defun get-nav-mesh ((arg0 actor-id))
   (let ((gp-0 (the-as nav-mesh #f)))
-    (let* ((s5-0 (entity-nav-mesh-by-aid arg0))
-           (v1-0 (if (type? s5-0 entity-nav-mesh)
-                     s5-0
-                     )
-                 )
-           )
+    (let ((v1-0 (as-type (entity-nav-mesh-by-aid arg0) entity-nav-mesh)))
       (if v1-0
           (set! gp-0 (-> v1-0 nav-mesh))
           )