Delete timers in the thread they were created.

heartbeatTimer was deleted properly, but not initialTimer.
This cause ASSERT-type crash when using Qt compiled in debug mode (and would have misbehaved regardless)
Add methods to CommandLineParser and CommandLineArg
Add support to send user notification via the UDP listener interface
Add ability to send notifications via frontend telnet interface
Add support to send user notification using mythutil

Additionally, make help a tad more intuitive for sending UserEvent (detail message_text and timeout value)