Removed all the Trim()s since any whitespace will be caught by the other checks anyway.
Made the codeword table a Dictionary, MS does not recommend using Hasttable anymore.
Made the codeword table initialized once for the Codabar class.
Removed the "}//comment" since all the code fits easlity on the screen.
Fixed an error message contain two spaces when it should have been one.
216% faster (Encode_Codabar() that is, not including the rendering time).