- Updated getitem and guardian entries in script_commands.txt.

- Fixed getitem trying to get <character ID> from the wrong argument.
- Now getitem can be run on scripts without a player attached if <character ID> is specified.
- Now the two last arguments of guardian are optional and independant of each other ("<event label>" and <guardian index>). This way the previous implementation and script_commands definition are still valid code.
- Now buildin function names and argument definitions are checked for validity before adding the function to the script engine.
  Argument definitions follow the pattern:
    (v|s|i|l)*\?*\*?
    v - value (string or int)
    s - string
    i - int
    l - label
    ? - one optional parameter
    * - unknown number of optional parameters

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@9599 54d463be-8e91-2dee-dedb-b68131a5f0ec

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