Add trigger collisions.

[moisesjpelaez]

Taking bits from here from @Dev-MarkoF. One thing is manifolds should be cleared/detached in World.hx (but I'm not sure what does that mean).

I hope this helps as a starting point if it doesn't close #45 .

Tested and working in Armory 2024.07

[saharan]

Thank you, it definitely helps!
I need to edit and test it before merge though, e.g. shapes should have the isTrigger flag, not rigid bodies because collision events occur per shape pair.

[moisesjpelaez]

I moved the isTrigger flag to Shape. I also attempted a fix when trigger collisions occur, by reducing the manifolds to 1 in World.step(), however after a trigger collision happens, sometimes the non-trigger body that collided pass through other non-trigger bodies for a few milliseconds.

Edit: I just fixed the trespassing issue.

[moisesjpelaez]

Closed PR as I made the changes in my fork's main branch.