sniffer/addons/net_hook.lua:

- Fixed syntax errors.
- Finished "proper" handling of tables.
- Switched orders of read/write hooks, had them backwards.
- Hooked into net.(Read/Write)Table and net communication functions, so
net_hook.lua is fully finished.

sniffer/plugins/net_sniffer.lua:
- Syntax error clean up.
- Put hook functions into PLUGIN scope.
- Removed indexing of type and value variables in non-Table loops,
whoops.