Convert the codebase to Objective-C++ (#1206)

* Convert the codebase to Objective-C++ throughout. One language is better than two.

* Put it back

* Fix linker

* Point explicitly to updated Weaver to unblock build

* Revert "Point explicitly to updated Weaver to unblock build"

This reverts commit fdc25296e8794d4e6e56c35f5fe6da2be3f71dbc.

* Revert "Fix linker"

This reverts commit 7be25f91519b8497ef42de79f115bcfbdb965c39.

* Add in the frameworks

* no message

* Address spec lint warnings

* Fix tvos build

* Put that back

* Address Michael's review

* Add comment to kick CI

Source/TextKit/ASLayoutManager.mm

@@ -0,0 +1,42 @@
+//
+//  ASLayoutManager.mm
+//  Texture
+//
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import <AsyncDisplayKit/ASLayoutManager.h>
+
+@implementation ASLayoutManager
+
+- (void)showCGGlyphs:(const CGGlyph *)glyphs
+           positions:(const CGPoint *)positions
+               count:(NSUInteger)glyphCount
+                font:(UIFont *)font
+              matrix:(CGAffineTransform)textMatrix
+          attributes:(NSDictionary *)attributes
+           inContext:(CGContextRef)graphicsContext
+{
+
+  // NSLayoutManager has a hard coded internal color for hyperlinks which ignores
+  // NSForegroundColorAttributeName. To get around this, we force the fill color
+  // in the current context to match NSForegroundColorAttributeName.
+  UIColor *foregroundColor = attributes[NSForegroundColorAttributeName];
+  
+  if (foregroundColor)
+  {
+    CGContextSetFillColorWithColor(graphicsContext, foregroundColor.CGColor);
+  }
+  
+  [super showCGGlyphs:glyphs
+            positions:positions
+                count:glyphCount
+                 font:font
+               matrix:textMatrix
+           attributes:attributes
+            inContext:graphicsContext];
+}
+
+@end