title: SKLabelNode PhysicsBody Issue
body: <p>The game <a href="https://apps.apple.com/us/app/supertype/id1349292121" rel="nofollow noreferrer">Supertype</a> is incredible.<br>
  I was thinking about making an app similar to it.
  Is there any easy way to turn the text of a SKLabelNode into a Physics Body?</p>
  
  <p>for example, I want to have the letter 'A' become a literal Physics Body<br>
   - Is there any simplistic way to achieve this without having to actually define each cgPath?<br>
   - I guess I could make the 'A' a SKSpriteNode, but this seems poor.</p>
  
  <p>Also,<br>
  I've had many problems turning SKSpriteNodes into Physics Bodies. I can easily turn a single image into a physicsBody, but if it's an image broken apart by invisible segments, things brake. Swift chooses a specific segment to become a physicsBody.<br>
   • I'm also so upset, since you can't define a concave shape and make a Physics Body. But you can have concave contiguous images become physics bodies nicely.</p>
  
  <p>Last,,<br>
  It would be very nice to have a word turn into a Physics Body, and with a Boolean, define it to fall apart or stick together. Is there a way to do this?<br>
  (I'm thinking I can do it by clumping an array of them in the initialization: [SKPhysicsBody])</p>