fix: imhex uses all memory

[paxcut]

The issue is caused by loops like the following

     while (!sequence(tkn::Separator::RightBrace)) {
            auto statement = parseFunctionStatement();
            if (statement == nullptr)
                continue;

            body.push_back(std::move(statement));
        }

so that if the function does nor advance the token pointer, the loop never ends even if errors are generated. Some of these loops solve that by calling

          if (hasErrors())
                break;

in which case generating errors is enough to avoid the problem. In this fix I changed all potentially exploding loops to check for errors and I tested the result with all the types of variables that use the loops like try/catch, unions, conditionals, match statements , ... and the problem seems resolve for good.