[decompiler] decompile particle defs using specialized macros (#1077)

* [decompiler] `defpart` and `defpartgroup`

* support sounds in part defs natively

* make `meters_to_string`

* update refs

* clang

* make macros in pair only work inside `(unquote ...`

* update source

* update finish

* fix

test/decompiler/reference/engine/debug/part-tester_REF.gc

@@ -5,17 +5,7 @@
 (declare-file (debug))
 (when *debug-segment*
 ;; failed to figure out what this is:
-(set! (-> *part-group-id-table* 105)
-      (new 'static 'sparticle-launch-group
-        :length 2
-        :duration #xbb8
-        :linger-duration #x5dc
-        :name "group-part-tester"
-        :launcher
-        (new 'static 'inline-array sparticle-group-item 2 (sp-item 56) (sp-item 57))
-        :bounds (new 'static 'sphere :w 4096.0)
-        )
-      )
+(defpartgroup group-part-tester :id 105 :bounds (static-bspherem 0 0 0 1) :parts ((sp-item 56) (sp-item 57)))
 
 ;; definition of type part-tester
 (deftype part-tester (process)