Leak in CTFramesetterCreateWithAttributedString due to assignment (vs. attach) of ret->_typesetter

[jaredhms]

This code leaks:

CTFramesetterRef CTFramesetterCreateWithAttributedString(CFAttributedStringRef string) {
    _CTFramesetter* ret = [_CTFramesetter alloc];
    ret->_typesetter = static_cast<_CTTypesetter*>(CTTypesetterCreateWithAttributedString(string));
    return static_cast<CTFramesetterRef>(ret);
}

Which causes runtime leaks when calculating font sizes in UIKit; for example:

Identifier Count Size (Bytes) Count Diff. Size Diff (Bytes) Module

• -[UILabel intrinsicContentSize] 14 352 +14 +352 UIKIT.DLL
  • -[NSString(UIKitAdditions) sizeWithFont:] 14 352 +14 +352 UIKIT.DLL
    • -[NSString(UIKitAdditions) sizeWithFont:constrainedToSize:] 14 352 +14 +352 UIKIT.DLL
      • -[NSString(UIKitAdditions) _sizeWithAttributes:constrainedToSize:] 14 352 +14 +352 UIKIT.DLL
        • -[NSAttributedStringPrototype initWithString:attributes:] 12 320 +12 +320 FOUNDATION.DLL
          • CFAttributedStringCreate 12 320 +12 +320 COREFOUNDATION.DLL
            • CFDictionaryCreateMutableCopy 6 176 +6 +176 COREFOUNDATION.DLL
            • CFRunArrayCreate 4 112 +4 +112 COREFOUNDATION.DLL
            • _CFRuntimeCreateInstance 2 32 +2 +32 COREFOUNDATION.DLL
              • CFAllocatorAllocate 2 32 +2 +32 COREFOUNDATION.DLL
                • __CFAllocatorSystemAllocate 2 32 +2 +32 COREFOUNDATION.DLL
                  [External Code] 2 32 +2 +32 [External Code]
        • CTFramesetterCreateWithAttributedString 2 32 +2 +32 CORETEXT.DLL
          • CTTypesetterCreateWithAttributedString 2 32 +2 +32 CORETEXT.DLL
            • +[NSObject alloc] 2 32 +2 +32 FOUNDATION.DLL
              • +[NSObject allocWithZone:] 2 32 +2 +32 FOUNDATION.DLL
                • class_createInstance 2 32 +2 +32 LIBOBJC2.DLL
                  • allocate_class 2 32 +2 +32 LIBOBJC2.DLL
                    [External Code] 2 32 +2 +32 [External Code]

We should fix this and scrub the rest of the codebase for similar issues.