Add an option to ignore perpendicular collisions in move_and_slide

[Dadibom]

I have been having big troubles with most of my object scripts, as move_and_slide returns true (and a list of collisions) if i walk alongside a wall (edge to edge), or if i walk towards a wall and then start moving away from it (because it's edge to edge before the collision)

To fix this, i now add a helper method to all my objects:

func move_and_slide2() -> bool:
	if move_and_slide():
		for i in get_slide_collision_count():
			var collision = get_slide_collision(i)
			if collision.get_normal().dot(velocity) < 0:
				return true
	return false

It would be nice to be able to just click a checkbox on CharacterBody2D to not report perpendicular "grazing" perpendicular collisions in the first place.

Edit production team: added syntax highlight

[Dadibom]

To clarify, currently all three of these scenarios report a collision with move_and_slide, whereas what i expect (and what my helper method achieves) is for only B to be treated as a collision