Remove frame from PApplet

[benfry]

Using frame.xxx() has been deprecated since 3.x, and it's time to remove it so that we're not dealing with AWT collisions.

Before we can remove it completely, however, we need to add a message to the PDE that catches use of frame.setTitle() and others in code, and tells users to replace it with surface.setTitle(). Better yet, offer to replace it in the code by clicking a button.

Further, these methods need to be re-thought, since they're used more than intended/expected: #53

[benfry]

For 4.0a2, removing frame entirely. Gonna see if this means all hell breaks loose.

Need to help users with the change: #59

[github-actions]

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