(init-vf0-vector) to make vector code a bit more readable (#494)

* decomp: Use a macro for loading VF0 (maybe should be in goal-lib.gc?)

* update references

* lint: format

* delete now unused file

test/decompiler/reference/all_forward_declarations.gc

@@ -588,3 +588,8 @@
 (define-extern vector-rad<-vector-deg/2! (function vector vector int))
 
 (define-extern sprite-distorter-generate-tables (function none))
+
+(defmacro init-vf0-vector ()
+  "Initializes the VF0 vector which is a constant vector in the VU set to <0,0,0,1>"
+  `(.lvf vf0 (new 'static 'vector :x 0.0 :y 0.0 :z 0.0 :w 1.0))
+  )