Arg: Track if the arg should export

Author: hexaredecimal

src/main/java/org/piccode/ast/Arg.java

@@ -10,15 +10,18 @@
 public class Arg extends Ast {
 	public String name;
 	public Ast def_val;
+	public boolean export;
 
 	public Arg(String name, Ast def_val) {
 		this.name = name;
 		this.def_val = def_val;
+		this.export = false;
 	}
 
 	public Arg(String name) {
 		this.name = name;
 		this.def_val = null;
+		this.export = false;
 	}
 
 	@Override