[breaking] delete ptr deref prefix op

start using zig-fmt-pointer-reform branch build of zig fmt
to fix code to use the new syntax

all of test/cases/* are processed, but there are more left
to be done - all the std lib used by the behavior tests

src/ast_render.cpp

@@ -66,7 +66,6 @@ static const char *prefix_op_str(PrefixOp prefix_op) {
         case PrefixOpNegationWrap: return "-%";
         case PrefixOpBoolNot: return "!";
         case PrefixOpBinNot: return "~";
-        case PrefixOpDereference: return "*";
         case PrefixOpMaybe: return "?";
         case PrefixOpUnwrapMaybe: return "??";
     }