Replace the RLE-based getType() function with one that binary-

Replace the RLE-based getType() function with one that binary-
searches a list of (start,end,type) tuples. This increases data size
by about 5Kb, which is a shame; but on the plus side, it boosts
performance from O(N) to O(log N). As an added bonus, the table now
covers _all_ of Unicode, not just the BMP.

git-svn-id: http://svn.tartarus.org/sgt/putty@4964 cda61777-01e9-0310-a592-d414129be87e