deftype and defmethod syntax major changes (#3094)

Major change to how `deftype` shows up in our code:
- the decompiler will no longer emit the `offset-assert`,
`method-count-assert`, `size-assert` and `flag-assert` parameters. There
are extremely few cases where having this in the decompiled code is
helpful, as the types there come from `all-types` which already has
those parameters. This also doesn't break type consistency because:
  - the asserts aren't compared.
- the first step of the test uses `all-types`, which has the asserts,
which will throw an error if they're bad.
- the decompiler won't emit the `heap-base` parameter unless necessary
now.
- the decompiler will try its hardest to turn a fixed-offset field into
an `overlay-at` field. It falls back to the old offset if all else
fails.
- `overlay-at` now supports field "dereferencing" to specify the offset
that's within a field that's a structure, e.g.:
```lisp
(deftype foobar (structure)
  ((vec    vector  :inline)
   (flags  int32   :overlay-at (-> vec w))
   )
  )
```
in this structure, the offset of `flags` will be 12 because that is the
final offset of `vec`'s `w` field within this structure.
- **removed ID from all method declarations.** IDs are only ever
automatically assigned now. Fixes #3068.
- added an `:overlay` parameter to method declarations, in order to
declare a new method that goes on top of a previously-defined method.
Syntax is `:overlay <method-name>`. Please do not ever use this.
- added `state-methods` list parameter. This lets you quickly specify a
list of states to be put in the method table. Same syntax as the
`states` list parameter. The decompiler will try to put as many states
in this as it can without messing with the method ID order.

Also changes `defmethod` to make the first type definition (before the
arguments) optional. The type can now be inferred from the first
argument. Fixes #3093.

---------

Co-authored-by: Hat Kid <6624576+Hat-Kid@users.noreply.github.com>

test/decompiler/reference/jak2/engine/process-drawable/process-taskable-h_REF.gc

@@ -3,42 +3,40 @@
 
 ;; definition of type process-taskable
 (deftype process-taskable (process-focusable)
-  ((task              game-task-control         :offset-assert 204)
-   (ambient           ambient-control   :inline :offset-assert 208)
-   (neck-joint-index  int32                     :offset-assert 224)
-   (talk-message      text-id                   :offset-assert 228)
-   (bounce-away       symbol                    :offset-assert 232)
-   (will-talk         symbol                    :offset-assert 236)
-   (look-at-me        symbol                    :offset-assert 240)
-   (hide-during-movie symbol                    :offset-assert 244)
-   (talk-distance     meters                    :offset-assert 248)
-   (talk-height       meters                    :offset-assert 252)
-   (last-talk         time-frame                :offset-assert 256)
-   (want-to-say       time-frame                :offset-assert 264)
-   (birth-time        time-frame                :offset-assert 272)
-   (slave             handle                    :offset-assert 280)
+  ((task               game-task-control)
+   (ambient            ambient-control  :inline)
+   (neck-joint-index   int32)
+   (talk-message       text-id)
+   (bounce-away        symbol)
+   (will-talk          symbol)
+   (look-at-me         symbol)
+   (hide-during-movie  symbol)
+   (talk-distance      meters)
+   (talk-height        meters)
+   (last-talk          time-frame)
+   (want-to-say        time-frame)
+   (birth-time         time-frame)
+   (slave              handle)
    )
-  :heap-base #xa0
-  :method-count-assert 38
-  :size-assert         #x120
-  :flag-assert         #x2600a00120
+  (:state-methods
+    hide
+    idle
+    (active game-task-event)
+    (play-game game-task-event)
+    )
   (:methods
-    (hide () _type_ :state 27)
-    (idle () _type_ :state 28)
-    (active (game-task-event) _type_ :state 29)
-    (play-game (game-task-event) _type_ :state 30)
-    (process-taskable-method-31 (_type_) none 31)
-    (process-taskable-method-32 (_type_) none 32)
-    (init-art! (_type_) none 33)
-    (process-taskable-method-34 (_type_) symbol 34)
-    (get-art-elem (_type_) art-element 35)
-    (process-taskable-method-36 (_type_) none 36)
-    (process-taskable-method-37 (_type_) none 37)
+    (process-taskable-method-31 (_type_) none)
+    (process-taskable-method-32 (_type_) none)
+    (init-art! (_type_) none)
+    (process-taskable-method-34 (_type_) symbol)
+    (get-art-elem (_type_) art-element)
+    (process-taskable-method-36 (_type_) none)
+    (process-taskable-method-37 (_type_) none)
     )
   )
 
 ;; definition for method 3 of type process-taskable
-(defmethod inspect process-taskable ((this process-taskable))
+(defmethod inspect ((this process-taskable))
   (when (not this)
     (set! this this)
     (goto cfg-4)