Fix some deprecation notices on macOS 10.14

Fix some deprecation notices on macOS 10.14

* src/nsimage.m ([EmacsImage setXBMColor:]): Replace colorSpaceName
code.
* src/nsmenu.m ([EmacsDialogPanel initWithContentRect:styleMask:]):
Remove reference to oneShot.
* src/nsterm.h (ns_enable_screen_updates): Remove function prototype.
(NSPasteboardTypeString):
(NSPasteboardTypeTabularText):
(NSControlStateValueOn):
(NSControlStateValueOff):
(NSBezelStyleRounded):
(NSPasteboardTypeURL): Define new names and replace all callers.
* src/nsterm.m ([EmacsColor colorUsingDefaultColorSpace]): Replace
calls to colorUsingColorSpaceName on macOS > 10.7.
([EmacsView performDragOperation:]): Add FIXME about deprecation.
(ns_disable_screen_updates):
(ns_enable_screen_updates): Remove functions and all callers.
(disable_screen_updates_count): Remove variable.
* src/macfont.m (macfont_draw): Use CGContext instead of graphicsPort
on macOS >= 10.10