Improve Swift binding of InputMethodKit

Originator:mzpppp
Number:rdar://39380486 Date Originated:2018/04/12
Status:Open Resolved:
Product:macOS + SDK, Keyboards, mice and trackpads Product Version:
Classification: Reproducible:
 
Swift binding of InputMethodKit uses many `Any!`. So this binding might cause type error.

Especially following methods require more typed binding:

- (BOOL)handleEvent:(NSEvent*)event client:(id)sender;
  => `sender`  argument is confirmed to some protocols, but its information is missing.

- (void)setMarkedText:(id)string selectionRange:(NSRange)selectionRange replacementRange:(NSRange)replacementRange;
  => When pass nil as first argument, IMK will crash. So it should be forbidden by type system.

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