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Changed the public interface of Scanner to resemble an STL container.

We were getting memory leaks (as told by the CRT detectors, which I also added), and there's really no reason (as long as we're careful) to use pointers there.

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Combined the myriad ScannerExceptions and ParserExceptions to a single ParserException class that has a message and a line/column position in the file where the error occurred.

Fixed a silly bug in the simple key pushing (queues are FIFO!).

Instead of deriving different tokens from a base Token class, we now use an enumerated TOKEN_TYPE to distinguish types. This is so we don't have to cast all the time when parsing the resulting token stream.
Also, removed start/end stream tokens.

Will be completely wiped, I think, in favor of a Scanner (to tokens), then Parser mechanism.