Added options to specify the height of the marker bounce and time the marker remains on the screen.
Usage:
[PvtMsg ("message") (z-bounce) (lifespan)
[pvtmsg Attention
[pvtmsg Attention 5 10
If your message contains spaces it has to be inside quotes.
[pvtmsg "Grab the backpack"
[pvtmsg "Grab the backpack" 6 20
If you just want the marker enclose a space between quotes for the message
pvtmsg " " 6 10
If you want to specify the marker lifespan you must use the height also.
