Method wait

Server/src/safeQueue.hpp:192–198

* new method to wait for the mutex lock. When the queue is empty the lock is on. * calling this method will cause the caller to block until there are new entries */

     *    calling this method will cause the caller to block until there are new entries
     */
    bool wait() {
        while (size() <= 0) {
            usleep(10000);
        }

        return true;
    }

    void setLimit(uint32_t limit) {
        this->limit = limit;