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>

goal_src/jak2/engine/debug/memory-usage.gc

@@ -39,11 +39,11 @@
   obj
   )
 
-(defmethod mem-usage object ((this object) (arg0 memory-usage-block) (arg1 int))
+(defmethod mem-usage ((this object) (arg0 memory-usage-block) (arg1 int))
   this
   )
 
-(defmethod calculate-total memory-usage-block ((this memory-usage-block))
+(defmethod calculate-total ((this memory-usage-block))
   "@returns The total sum of all [[memory-usage-info]] `total`s"
   (let ((sum 0))
     (dotimes (idx (-> this length))
@@ -53,7 +53,7 @@
     )
   )
 
-(defmethod reset! memory-usage-block ((this memory-usage-block))
+(defmethod reset! ((this memory-usage-block))
   "Sets `length` to 0 as well as resets all fields except `name` in the associated [[memory-usage-info]]"
   (set! (-> this length) 0)
   (dotimes (idx 112)
@@ -78,7 +78,7 @@
     )
   )
 
-(defmethod compute-memory-usage! level ((this level) (force? symbol))
+(defmethod compute-memory-usage! ((this level) (force? symbol))
   "Calculates the memory usage of the level, returns and stores the [[memory-usage-block]]
 in `mem-usage-block` as well as the total size in `mem-usage`
 
@@ -97,7 +97,7 @@ in `mem-usage-block` as well as the total size in `mem-usage`
   (-> this mem-usage-block)
   )
 
-(defmethod mem-usage process-tree ((this process-tree) (arg0 memory-usage-block) (arg1 int))
+(defmethod mem-usage ((this process-tree) (arg0 memory-usage-block) (arg1 int))
   (let ((v1-0 90))
     (let* ((a0-1 *dead-pool-list*)
            (a3-0 (car a0-1))
@@ -310,7 +310,7 @@ in `mem-usage-block` as well as the total size in `mem-usage`
 
 (define *max-dma* 0)
 
-(defmethod print-mem-usage memory-usage-block ((this memory-usage-block) (level level) (fmt-dest object))
+(defmethod print-mem-usage ((this memory-usage-block) (level level) (fmt-dest object))
   (local-vars (sv-16 object) (sv-32 string) (sv-48 int))
   (let ((s3-0 (&- (-> level heap current) (the-as uint (-> level heap base)))))
     (let ((v1-2 (+ (-> this data 61 total) (-> this data 62 total))))