[decomp] better handling of animation code and art files (#1352)

* update refs

* [decompiler] read and process art groups

* finish decompiler art group selection & detect in `ja-group?`

* make art stuff work on offline tests!

* [decompiler] detect `ja-group!` (primitive)

* corrections.

* more

* use new feature on skel groups!

* find `loop!` as well

* fully fledged `ja` macro & decomp + `loop` detect

* fancy fixed point printing!

* update source

* `:num! max` (i knew i should've done this)

* Update jak1_ntsc_black_label.jsonc

* hi imports

* make compiling the game work

* fix `defskelgroup`

* clang

* update refs

* fix chan

* fix seek and finalboss

* fix tests

* delete unused function

* track let rewrite stats

* reorder `rewrite_let`

* Update .gitattributes

* fix bug with `:num! max`

* Update robotboss-part.gc

* Update goal-lib.gc

* document `ja`

* get rid of pc fixes thing

* use std::abs

test/decompiler/reference/levels/common/joint-exploder_REF.gc

@@ -611,10 +611,7 @@
     (set! (-> self state-time) (-> *display* base-frame-counter))
     (until (>= (- (-> *display* base-frame-counter) (-> self state-time)) (-> self tuning duration))
       (suspend)
-      (let ((a0-0 (-> self skel root-channel 0)))
-        (set! (-> a0-0 param 0) 1.0)
-        (joint-control-channel-group-eval! a0-0 (the-as art-joint-anim #f) num-func-loop!)
-        )
+      (ja :num! (loop!))
       )
     (none)
     )
@@ -753,10 +750,7 @@
   (logior! (-> self skel status) (janim-status inited))
   (set! (-> self anim) (the-as art-joint-anim (-> self draw art-group data arg1)))
   (ja-channel-set! 1)
-  (let ((gp-1 (-> self skel root-channel 0)))
-    (joint-control-channel-group-eval! gp-1 (-> self anim) num-func-identity)
-    (set! (-> gp-1 frame-num) 0.0)
-    )
+  (ja :group! (-> self anim) :num! min)
   (ja-post)
   (TODO-RENAME-23 self)
   (set! (-> self die-if-below-y) (+ -102400.0 (-> self root trans y)))