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/debug/editable-player_REF.gc

@@ -1110,7 +1110,7 @@
   )
 
 ;; definition for method 9 of type editable-array
-(defmethod editable-array-method-9 editable-array ((this editable-array) (arg0 editable-command) (arg1 mouse-info))
+(defmethod editable-array-method-9 ((this editable-array) (arg0 editable-command) (arg1 mouse-info))
   (if (execute-select this arg0 arg1)
       (return #f)
       )
@@ -1424,7 +1424,7 @@
   )
 
 ;; definition for method 10 of type editable-player
-(defmethod deactivate editable-player ((this editable-player))
+(defmethod deactivate ((this editable-player))
   (dotimes (v1-0 (-> *level* length))
     (let ((a1-3 (-> *level* level v1-0)))
       (if (= (-> a1-3 status) 'active)
@@ -1440,7 +1440,7 @@
 
 ;; definition for method 7 of type editable-player
 ;; WARN: Return type mismatch process-drawable vs editable-player.
-(defmethod relocate editable-player ((this editable-player) (arg0 int))
+(defmethod relocate ((this editable-player) (arg0 int))
   (let ((v1-0 *kernel-context*))
     (set! (-> v1-0 relocating-process) this)
     (set! (-> v1-0 relocating-min) (the-as int (&-> this type)))
@@ -1461,7 +1461,7 @@
 
 ;; definition for method 21 of type editable-player
 ;; WARN: Return type mismatch int vs none.
-(defmethod editable-player-method-21 editable-player ((this editable-player))
+(defmethod editable-player-method-21 ((this editable-player))
   (set! *display-region-marks* #f)
   (let* ((s5-0 (-> this current length))
          (s4-0 0)