C# Support, Attempt 1

[D. R. E. M. <li...@mf...>]

Since I was wandering by the website, I noticed that there was an email 
from a couple days ago asking about C# mode. Since it didn't look like 
anyone was currently working on it, plus I really wanted to use Emacs 
for my next C# project, I made an initial stab at a C# mode using the 
derived mode example. I don't think I used anything outside of cc-mode 
5.30.9, so it should be self-contained.

I only worked on it for a couple of hours, but it covers about 
everything I use C# at this point. I also figured it was a good learning 
experience for me since I haven't touched lisp in a very long time. The 
hard part was figuring out the Java-specific regexes.

Feedback would be appreciated since I like making sure things work 
properly. And, if I shouldn't do this, just tell me and I'll drop it. :)

Cheers,
Dylan