[Fix] in timer library
[Fix] in timer library

timer.simple was throwing an error if the entity got removed while the timer was running

Fixes #53

Xandaros/Starfall,Ingenious-Gaming/Starfall,INPStarfall/Starfall,Jazzelhawk/Starfall,INPStarfall/Starfall,Ingenious-Gaming/Starfall,Jazzelhawk/Starfall,Xandaros/Starfall