Check warnings disabled in Visual Studio solutions

[yz70s]

In the projects/solutions for Visual Studio generated with genie there are a lot of warnings that are disabled.
Maybe some of those do not need to be disabled anymore.
Maybe some are real problems that should not be ignored.

Check every warning that gets disabled and decide if it should stay disabled or not.

[pmackinlay]

This one shouldn't be required any more: a42f601