More cleanups and minor fixes for Customize.
* cus-edit.el (custom-face-edit-fix-value): Use custom-fix-face-spec. * custom.el (custom-push-theme): Cleanup (use cond). (disable-theme): Recompute the saved-face property. (custom-theme-recalc-face): Follow face alias before setting prop. * custom.el (custom-fix-face-spec): New function; code moved from custom-face-edit-fix-value. (custom-push-theme): Use it when checking if a face has been changed outside customize. (custom-available-themes): New function. (load-theme): Use it. * image.el (image-checkbox-checked, image-checkbox-unchecked): New variables, containing checkbox images. * startup.el (fancy-startup-tail): * wid-edit.el (checkbox): Use them.
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