fix race conditions and memory corruption #4
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replaced the combination of calloc and strncpy with strdup. the latter caused out of bounds writes which corrupted internal malloc state. fixes digination#3
the thread callback function was allocating everything on the heap without good reason, and constructing copies of strings manually with combinations of malloc, strncpy, strncat, etc. i simplified all such sites to use a single snprintf into a stack buffer, which is then passed as argument to curl. additionally i changed the while(queue->head) loop such that the loop is always entered, but the queue head pointer is only fetched when the lock is held, in order to prevent races with other threads.
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