Added Obvious Feature

Heyo just passing  by to leave an "Unload All" function in the "Cell Loader" script.

Function unloads all the scenes loaded with the Cell Loader System.

I didn't add it in the first place since I had made unloading automatic but thinking about some of its applications made me reconsider so here it is added in. And yes there is an individual unload function in there already.

That's all from me, thanks for stopping by and cya next time!