this should make future debugging sessions easier, telling us what bugs were or were not fixed at the time of an incident.
added a test to make sure data file can be read/written, and at a minimum, sets global data-version.
also clean up test framework a bit, and introduce a helpful macro.
add a default message for when no messages are loaded, so that msg_feedback/msg_message doesn't return NULL when XML has not been laoded.
initialize some core stuff before running tests (there probably needs to be more).
new tests in progress.
remove giveitem.c attribute, the name clashed with a trigger,
and it was only part of an arena that is gone from the game, I think.
