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(Thanks to Vadim Zeitlin)

Added Read() functions for Node that return true/false, so we can easily check if a read is successful without throwing.
But we still have operator >> that throws on failure.

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Switched the Iterator implementation to a dedicated helper class  (to hide the specific implementation, since it's pretty messy and may change).

Fixed a bug in the last newline of a block folded scalar.

Specialized the overloaded [] operator for int/unsigned, and added a size() function, so that you can iterate through a sequence node like a vector.

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

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

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