basic_ifstream implementation

[Josh Juran]

I'm ready to begin work on a basic_ifstream implementation for Wine, which is needed for the game Vampire Secrets among others.

http://bugs.winehq.org/show_bug.cgi?id=28612

First I'd like to check that Piotr isn't already working on this.  If not, I'm open to any advice on how to proceed.  My plan is to create fstream.c, and use string.c as a guide.

Josh