Cancels a previously set GEL timer.
timer_id specifies the same timer_id that was used to set the timer.
Cancels a timer that was previously set with GEL_SetTimer. The timer_id specified in the second parameter of GEL_SetTimer uniquely identifies the timer, and that same value used in this function cancels that specific timer.
Synchronous from GEL: Yes
Completely synchronous: Yes