Water collision and All/None button

[StephenAlverez]

Another small improvement, just to make things simple.

Let's say you want to make a boat without all the lag of water, and instead of water, you put to wheels on the boat and put it on a plane that collide with the wheels, so it acts like a boat. This is all well and good, but reserving a collision group is very annoying, so my idea is a button that makes the plane collide with water, because it has the same collision group as water. This would allow it to "be" water.

This one is ultra simple.

You have a laser, with all the collision groups on as a normal default. Instead of going and un-clicking every button, you can press one that either turns all collision groups on or off.