[Mono-dev] csproj files for Mono's class libraries.

[Levi Bard]

>>    Ideally, we can turn this into building Mono entirely using
>> msbuild, which should be a lot faster than using the cygwin/makefile
>> setup.

Hooray! This is something that's been lacking for a long time.
Hopefully it will encourage debugging/testing/fixing on windows for
core team members as well: there won't be the "I could never get a
working environment set up on windows" excuse...

> Please ensure that MonoDevelop can be used as well. [...] I prefer to use MonoDevelop even
> when on Windows.

+1!