Close #1363 - stop program on ctrl-c (SIGINT)
Close #1363 - stop program on ctrl-c (SIGINT)

Handles Ctrl-C (SIGINT) for the curses interface, stopping the program.

Testing:
1). Did Ctrl-C in non-curses interface. Observed the program stop:
```
$ goaccess access.log -o report.html --log-format COMBINED --real-time-html
```

2). Did Ctrl-C in curses interface. Observed the program stop:
```
$ goaccess access.log
```

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