This useful functions allows to browse all value pairs of a hashtable without
having to allocate some memory for keys and then retrieving each element.
It may also make sense with synchronized hashtables because before you were forced to
HashTable_GetKeys() and then HashTable_GetItemValue() which is locking again for each
element of the table.
- fixed invalid, missing or additional arguments
- removed all type casts from arguments
- added missing (void*) typecasts for %p arguments
- use inttypes defines where appropriate
