fix: should not be assumed to always interact with the same group

[noih]

The interactive group is set by the users and should not be assumed to always interact with the same group. For example, a circle can also collide with a rectangle, but they still belong to different groups.

Stress testing is set to the same group only for testing purposes.

Here are two links for reference:
Box2d Doc
Box2D Tutorial: Collision filtering

[noih]

Based on the concept of specifying interact rather than just being in the same group, naming the checking function canInteract or checkInteract is more appropriate.

[Prozi]

this is sweet thanks again!! @noih

but I'd like to also create some kind of util/function for

(BodyGroup.Ellipse << 16) | BodyGroup.Ellipse;

this (SOMEGROUP1 << 16) | SOMEGROUP2 could have some function cause I dont believe this is clear

thx !!!

can u suggest something?

[noih]

I added a groupBits utility function. Hopefully that is helpful.

[Prozi]

I added a groupBits utility function. Hopefully that is helpful.

this is I think what I meant

[Prozi]

this looks very nice

thank you, again, for collaborating!

[Prozi]

@noih here https://github.com/Prozi/detect-collisions/releases/tag/v9.8.0 <3