Change action autoloading to allow actions in plugins
Since plugins may define custom actions, we shouldn't require that there be a file in our actions/ subdir for every action. So, I changed the (admittedly hackish) auto-loading code in index.php so it instead checks whether a class exists with the expected name. This, in turn, uses the increasingly hacking __autoload() function, which I changed to auto-load stuff named "BlahblahAction" from the actions subdir if available.
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