Character sequence generated by event.
CL_String CL_InputEvent::str();
Detailed description:
A key press can generate one, none or multiple characters, the reason for this are deadkeys, ie. press ^ + a and get ^, so the first press would generate no key and the second one, in case that the second key being pressed doesn't support the ^ it would generate two characters (ie. ^ + 5 => "", "o5")