fix(parser)

parser used to work depending on opening parenthesis and therefore
parsed e.g. `(if 0 (list 1 2 3) 1)` as two seperate expressions, thus
the example would print:
1
(1 2 3)

Now fixed by using a stack for parenthesis

lisp.h

@@ -78,10 +78,10 @@ void build_scopes(Scopes *scopes);
 void tokenize(Nob_String_View content, Tokens *tokens);
 
 int parse_one(Tokens *tokens, Node *node);
-void parse(Tokens *tokens, Nodes *nodes);
+int parse(Tokens *tokens, Nodes *nodes);
 
 int eval_one(Node input, Scopes *scopes, Node *result);
-int eval(Nodes *inputs, Scopes *scopes, Nodes *results);
+int eval(Nodes inputs, Scopes *scopes, Nodes *results);
 
 // builtins
 int lisp_function_add(Nodes *args, Scopes *scopes, Node *result);