Fix for "no root" alert

In Unix, `keyboard` requires root to set up a key listener. Instead of letting the listener thread fail with an exception, we'll skip setting up the listener in a non-root Unix setting.

lackey/__init__.py

@@ -47,7 +47,13 @@
 def _abort_script():
     thread.interrupt_main()
 
-keyboard.add_hotkey("alt+shift+c", _abort_script, suppress=True)
+# If we are not on Unix, or if we are on Unix and have root privileges, start the
+# alt+shift+c hotkey listener to abort the script
+if (not hasattr(os, "geteuid") or os.geteuid() == 0):
+    keyboard.add_hotkey("alt+shift+c", _abort_script, suppress=True)
+    print("Use Alt+Shift+C to abort script manually")
+else:
+    print("No root privileges: Unable to set Alt+Shift+C listener to abort script.")
 
 ## Sikuli patching: Functions that map to the global Screen region
 ## Don't try this at home, kids!