add null-safety to FlxTouchManager #3440
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A contribution towards #3267, which I decided to do after getting a null reference error in a null-safe class because
getFirst
wasn't annotated as nullable (although to be fair I should've read the documentation first...). I tried to do it based on how #3420 did it.Also I've noticed that PR also changes the parameter names from pascal case to camel case, should the same be done in this PR?