[0/4] usp10: new bidirectional algorithm

[Aric Stewart]

This is a complete rewrite of wine's bidirectional algorithm to match revision 29 which came with Unicode 6.3

Testing against the BidiTest.txt file distributed by Unicode to test the algorithm this change takes us from passing 85% of the level tests to passing all 100% if the 490846 tests.

I tried to keep the code as readable as possible and performance wise we are on par with native uniscribe and the original algorithm

-aric