Closing windows can cause segfaults or other bad exit codes

[cyanpelican]

For example on Mac, closing a window causes the following:
libc++abi.dylib: terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument
Abort trap: 6

[natevm]

I can reproduce this error on my machine. Will take a look...

[natevm]

I believe this is fixed.

In destroy_window in the GLFW wrapper class, the GLFW window was being destroyed after destroying its swapchain. Switching this order (destroying the window before destroying its swapchain) seems to have fixed the issue.

@cyanpelican If you get a chance, could you see if you get the same assertion as reported above on the latest version of development?