Fixes + Creating Instances with Pulse!

I've fixed several things that I broke or got broken with the last update.

But MOST importantly, 2 major updates:
Creating instances with Pulse is now functional! That is great news if you wish to have complex behaviours like reactive physics for your particles. And they are generated the exact same way as any other Pulse particle. Instance particles are just their own particle type. The magic happens in the code you will write on them!

Second update, it is now possible to limit particles by their  LIFE instead of their SPEED. Ok, so you might not even know what "limiting" a particle is. In order to get different emitter shapes, Pulse calculates the total trajectory of a particle and limits it so it doesn't go over the line. Before this was being done by changing the particle's speed, so it would be slower the closer to the border it was. Now all particles can have the same speed, and have their life reduced instead.

Among other things I also started commenting some of the code, added some exceptions for negative speed values, some changes to negative minimum radiuses for paths (so they emit from both sides of the path), and yeah. Just  a bunch really. Bunch of stuff.

Go do cool stuff with this! Ok bye