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cocoa: Another attempt at mouse vs touch support.
This time, we make anything we think is a MacBook trackpad report its touches as SDL_MOUSE_TOUCHID, even though they're not _actually_ synthesized events, and let all mouse input--even if the OS synthesized it from a multitouch trackpad on our behalf--look like physical input. This is backwards from reality, but produces the results most apps will expect. Note that if you have a real touch device that doesn't appear to be the trackpad, it'll produce real touch events with unique device ids, so it's not a total loss here, but also note that the way we decide if it was the trackpad is an imperfect heuristic; it happens to work out right now, but it's not impossible that a real touchscreen could come to the Mac at some point and (incorrectly?) call it a "mouse" input, etc. But for now, good enough. Fixes Bugzilla #4690.
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