[tvOS] Fixes errors when building against tvOS SDK (#728)

* [tvOS] Fixes errors when building against tvOS SDK

* Update CHANGELOG.md

* [tvOS] Fixes implicit conversion between UIViewAnimationCurve +
UIViewAnimationOptions

* Enable tvOS deployment target in Texture.podspec (for CI)

* [ASMultiplexImageNode] Fixes typo

* [tvOS] Fixes warnings related to @available guards in Xcode 9
[ASMultiplexImageNode] Enables support for Photos framework on tvOS 10+

[ASMultiplexImageNode] Fixes comment depth

[ASAvailability] Adjust logic in AS_AVAILABLE_IOS_TVOS to account for
both versions
Adjusts API_AVAILABLE to minimum deployment target

* [ASAvailability] Update AS_AVAILABLE_XXX fallbacks to function more like
the built-in solution (more accurately target OS by checking target)
Change AS_AVAILABLE_IOS -> AS_AVAILABLE_IOS_TVOS in places that shoud
allow for both

[ASAvailability] Simplify AS_AVAILABLE_IOS_TVOS

* [ASControlNode] Adds missing 'super' call in -[ASControlNode didLoad]
when targeting tvOS

* Fix API_AVAILABLE iOS requirement

* [ASDisplayNode] Fixes last of the linker warnings related to category
overrides. Removes methods already implemented in
ASDisplayNode+UIViewBridge category.
[ASControlNode] Moves tvOS category declaration to ASControlNode header
[ASImageNode] Moves tvOS category declaration to ASImageNode header
[ASControlNode+Private] Adds private category for ASControlNode to
access private selectors

* [NSParagraphStyle+ASText] Fixes typo related to testing

* [ASControlNode] Re-add helpful comment

* [ASTextKitCoreTextAdditions] Adds mappings for kCTParagraphStyleSpecifierMinimumLineSpacing, kCTParagraphStyleSpecifierMaximumLineSpacing, kCTParagraphStyleSpecifierLineSpacingAdjustment when mapping CTParagraphStyle onto NSParagraphStyle
[ASTextNode] Uses CoreText-cleansed attributed string when assigning ascender/descender to avoid crash when a CTParagraphStyle is passed as an attribute

* [AsyncDisplayKit] Update project file to include new/deleted files

* [ASControlNode+tvOS] Add missing Foundation import (whoops!)
[ASImageNode+tvOS] Add missing Foundation import (whoops!)

* Update podspec to only link AssetsLibrary framework on iOS

* [ASTextKitCoreTextAdditions] If kCTParagraphStyleAttributeName key-value
evaluates to an NSParagraphStyle, pass through to cleansed attributes. This
fixes a bug that would occur if a CTParagraphStyle was passed as an
attribute _alone_ (would not be caught by unsupported attributes
check)

* [ASMultiplexImageNode] Bump availability check to support < Xcode 9

* [ASTraitCollection] Fixes typo that was causing build to fail

* Clean up formatting to adhere to character/line limit + braces

Source/ASMultiplexImageNode.h

@@ -131,14 +131,12 @@ typedef NS_ENUM(NSUInteger, ASMultiplexImageNodeErrorCode) {
  */
 @property (nonatomic, assign, readwrite) BOOL shouldRenderProgressImages;
 
-#if TARGET_OS_IOS
 /**
  * @abstract The image manager that this image node should use when requesting images from the Photos framework. If this is `nil` (the default), then `PHImageManager.defaultManager` is used.
  
  * @see `+[NSURL URLWithAssetLocalIdentifier:targetSize:contentMode:options:]` below.
  */
-@property (nullable, nonatomic, strong) PHImageManager *imageManager;
-#endif
+@property (nullable, nonatomic, strong) PHImageManager *imageManager API_AVAILABLE(ios(8.0), tvos(10.0));
 @end
 
 
@@ -245,7 +243,6 @@ didFinishDownloadingImageWithIdentifier:(ASImageIdentifier)imageIdentifier
  */
 - (nullable NSURL *)multiplexImageNode:(ASMultiplexImageNode *)imageNode URLForImageIdentifier:(ASImageIdentifier)imageIdentifier;
 
-#if TARGET_OS_IOS
 /**
  * @abstract A PHAsset for the specific asset local identifier
  * @param imageNode The sender.
@@ -256,12 +253,10 @@ didFinishDownloadingImageWithIdentifier:(ASImageIdentifier)imageIdentifier
  * @note This method may be called from any thread.
  * @return A PHAsset corresponding to `assetLocalIdentifier`, or nil if none is available.
  */
-- (nullable PHAsset *)multiplexImageNode:(ASMultiplexImageNode *)imageNode assetForLocalIdentifier:(NSString *)assetLocalIdentifier;
-#endif
+- (nullable PHAsset *)multiplexImageNode:(ASMultiplexImageNode *)imageNode assetForLocalIdentifier:(NSString *)assetLocalIdentifier API_AVAILABLE(ios(8.0), tvos(10.0));
 @end
 
-#pragma mark - 
-#if TARGET_OS_IOS
+#pragma mark -
 @interface NSURL (ASPhotosFrameworkURLs)
 
 /**
@@ -275,9 +270,8 @@ didFinishDownloadingImageWithIdentifier:(ASImageIdentifier)imageIdentifier
 + (NSURL *)URLWithAssetLocalIdentifier:(NSString *)assetLocalIdentifier
                             targetSize:(CGSize)targetSize
                            contentMode:(PHImageContentMode)contentMode
-                               options:(PHImageRequestOptions *)options AS_WARN_UNUSED_RESULT;
+                               options:(PHImageRequestOptions *)options AS_WARN_UNUSED_RESULT API_AVAILABLE(ios(8.0), tvos(10.0));
 
 @end
-#endif
 
 NS_ASSUME_NONNULL_END