Use CGImage instead of NSBitmapImageRep (bug#32932)
* src/nsterm.m (ns_update_end): (ns_clear_frame): Remove forced draws. (ns_draw_fringe_bitmap): (ns_dumpglyphs_image): No longer need to invert images as the context is already flipped. ([EmacsView updateFrameSize:]): ([EmacsView initFrameFromEmacs:]): Use new function. ([EmacsView createDrawingBuffer]): Replaces createDrawingBufferWithRect:. ([EmacsView focusOnDrawingBuffer]): Set CGImage context. ([EmacsView windowDidChangeBackingProperties:]): Use new function. ([EmacsView copyRect:to:]): Copy using CGImages. ([EmacsView wantsUpdateLayer]): ([EmacsView updateLayer]): New Functions. ([EmacsView drawRect:]): We no longer do anything special here for Cocoa. ([EmacsView windowDidChangeBackingProperties:]): Fix indentation and add NSTRACE.