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/collide/collide-debug_REF.gc

@@ -6,7 +6,7 @@
 
 ;; definition for method 9 of type collide-cache
 ;; WARN: Return type mismatch int vs none.
-(defmethod debug-draw collide-cache ((this collide-cache))
+(defmethod debug-draw ((this collide-cache))
   (let ((gp-0 (the-as object (-> this tris))))
     (countdown (s4-0 (-> this num-tris))
       (let ((t1-0 (copy-and-set-field (-> *pat-mode-info* (-> (the-as collide-cache-tri gp-0) pat mode) color) a 64)))
@@ -55,17 +55,14 @@
 
 ;; definition of type col-rend-filter
 (deftype col-rend-filter (structure)
-  ((show-pat-set   pat-surface  :offset-assert   0)
-   (show-pat-clear pat-surface  :offset-assert   4)
-   (event-mask     uint32       :offset-assert   8)
+  ((show-pat-set    pat-surface)
+   (show-pat-clear  pat-surface)
+   (event-mask      uint32)
    )
-  :method-count-assert 9
-  :size-assert         #xc
-  :flag-assert         #x90000000c
   )
 
 ;; definition for method 3 of type col-rend-filter
-(defmethod inspect col-rend-filter ((this col-rend-filter))
+(defmethod inspect ((this col-rend-filter))
   (when (not this)
     (set! this this)
     (goto cfg-4)
@@ -185,7 +182,7 @@
 
 ;; definition for method 9 of type col-rend
 ;; INFO: Used lq/sq
-(defmethod col-rend-method-9 col-rend ((this col-rend))
+(defmethod col-rend-method-9 ((this col-rend))
   (let ((s5-0 (new 'stack-no-clear 'collide-query)))
     (let ((f30-0 (-> this bbox-radius)))
       (let ((v1-0 (-> this track)))