Garbage from subscribing to collision events

[writer51]

I just wanted to confirm because I did new benchmarks in a clean project. The new update is massively slower, despite the fact that it removes the garbage collection problem. Thank you for trying to fix this, but my recommendation is not to push this as an update for 3.3. I'm getting about 1/2-1/3 framerate of the old version. Garbage is preferable to that. If you guys have any other ideas please share them, otherwise I guess I will do my best with the regular version for now. 

Tested using collision event handler script included with the package (the commented out part with the color change).