Pause on context loss on Windows

[acgaudette]

Discovered by @hobogenized.

When running on Windows, the simulation pauses when window context is lost. However, a keyboard interrupt (in the shell) causes the simulation to resume.

After resetting to a very old commit (before the library split) we confirmed that this bug has not always existed.

I was unable to reproduce this on my OS (but I use a tiled window manager).

[hobogenized]

Seems to only happen in debug mode, and only if you click on the command prompt/terminal. Perhaps it isn't a bug; may require further investigation.

[acgaudette]

@hobogenized is this still relevant?