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Moved all the includes to a subfolder yaml-cpp so they don't interfere with other libraries' includes

Refactored the traits a bit, and added displaying the key to string and numeric key not found errors

Re-added the throw() specification to ~Exception(), and also to ~TypedKeyNotFound(); I suppose this'll fix the gcc compiler error.

Removed throw() specifier in Exception (I don't remember putting it in). This may solve a gcc error (I haven't tested it yet) or it may break it further.

Added a templated derived exception to KeyNotFound so that you can figure out *which* key wasn't found.

Added CMake scripts for other platforms\nFixed some bugs that gcc complained about\nFixed CR/LF vs LF bug

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.

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.

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There's a bug (and question): should we test simple keys' validity BEFORE stuff or AFTER stuff?

Refactored some common whitespace-parsing code in scanning both scalars.
Implemented the flow collection tokens.

We're now using exceptions for errors, and scanning/pushing tokens is exception-safe (using a set of "limbo tokens").