[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/engine/data/art-h_REF.gc

@@ -307,7 +307,7 @@
 
 ;; definition of type skeleton-group
 (deftype skeleton-group (basic)
-  ((art-group-name basic          :offset-assert   4)
+  ((art-group-name string         :offset-assert   4)
    (jgeo           int32          :offset-assert   8)
    (janim          int32          :offset-assert  12)
    (bounds         vector :inline :offset-assert  16)