[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/FormRegressionTest.cpp

@@ -233,8 +233,9 @@ std::unique_ptr<FormRegressionTest::TestData> FormRegressionTest::make_function(
                                       test->func, *dts);
 
       // move variables into lets.
+      LetRewriteStats dummy;
       insert_lets(test->func, test->func.ir2.env, *test->func.ir2.form_pool,
-                  test->func.ir2.top_form);
+                  test->func.ir2.top_form, dummy);
     }
   }
 
@@ -322,4 +323,4 @@ void FormRegressionTest::test_with_stack_structures(const std::string& code,
 }
 
 std::unique_ptr<InstructionParser> FormRegressionTest::parser;
-std::unique_ptr<DecompilerTypeSystem> FormRegressionTest::dts;
+std::unique_ptr<DecompilerTypeSystem> FormRegressionTest::dts;