Feature - table for all body parts that can fly off

[Synival]

We should have a table for each body part that can fly off when a char is killed. This would replace the switch() statement in death_cry().

Implementation details:

1. Create a random lookup in a table called part_table[] that contains one row for each PART_* bit.
2. Each row would have:
   1. The PART bit
   2. A vnum to the body part
   3. A message to the room when it flies off
3. Add a reference to the table in master_table[].
4. Add a JSON exporter in json_tblw.c
5. Add a JSON importer in json_tblr.c