Revert "no longer treat ctrl+c as "shutdown" - bitbotctl will take this job"

This reverts commit 73e6ede8cc.

modules/signals.py

@@ -10,6 +10,29 @@ class Module(ModuleManager.BaseModule):
 
     def SIGINT(self, signum, frame):
         print()
+        self.bot.trigger(lambda: self._kill(signum))
+
+    def _kill(self, signum):
+        if self._exited:
+            return
+        self._exited = True
+
+        self.events.on("signal.interrupt").call(signum=signum)
+
+        written = False
+        for server in list(self.bot.servers.values()):
+            if server.connected:
+                server.socket.clear_send_buffer()
+
+                line = utils.irc.protocol.quit("Shutting down")
+                sent_line = server.send(line, immediate=True)
+                sent_line.events.on("send").hook(self._make_hook(server))
+
+                server.send_enabled = False
+                written = True
+
+        if not written:
+            sys.exit()
 
     def _make_hook(self, server):
         return lambda e: self.bot.disconnect(server)