Code::Blocks support for windows

Going to merge this myself in a moment, but opened a PR for bookkeeping.

Added premake4 file that can be used to generate a Code::blocks workspace, as described here:
http://pioneerspacesim.net/forum/viewtopic.php?f=3&t=110

The file is under win32/codeblocks because for now this is windows only. It is possible to modify the script for visual studio, xcode, etc.

I also removed the obsolete VS2008 solution.