handle keyboard interrupt like gdb

[john-peterson]

this should handle keyboard interrupt like gdb

there was also a failed git command that silently killed make on my shallow clone despite V=1

[bluegr]

Please follow our commit guidelines and code formatting conventions

[sev-]

Could you please explain purpose of this change? In gdb you normally press Ctrl+C and you get to the gdb prompt. Why adding this platform-dependent getch() and calling exit() in a C++ application?

[bluegr]

@john-peterson thanks!

Regarding the git shallow clones fix, it has been merged in-tree in commit 7a72d6b.

Regarding the signal-related change, however, as @sev- mentioned, the behavior that is being introduced is platform specific. We already handle exiting from the application gracefully, so it's unclear why we would want to add such a platform-specific functionality, together with exit().

For the reasons above, I'm closing this, since we didn't get any further feedback. If you can find a good reason to introduce this functionality in a platform-independent manner, feel free to reopen this PR, but please also follow our commit guidelines, as stated above