Bug 16066 – Implement KnuthMorrisPrattFinder

Phobos has std.algorithm.searching.BoyerMooreFinder to use the Boyer-Moore string search algorithm with find. For some data [0,1] the Knuth-Morris-Pratt algorithm is superior. Phobos should have a KnuthMorrisPrattFinder as well, so people can easily try and benchmark both. [0] https://stackoverflow.com/questions/12656160/what-are-the-main-differences-between-the-knuth-morris-pratt-and-boyer-moore-sea [1] https://stackoverflow.com/questions/16085201/when-would-you-use-kmp-over-boyer-moore

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