ASSignpost: Add support for the os_signpost API, fixes (TextureGroup#…

…1501)

* ASSignpost: Add support for the os_signpost API

- Removes support for colored intervals. These weren't really useful and they aren't part of the signpost api.
- Fixes an issue with range controller interval logging.
- Adds an interval for interface orientation changes.

* Rename

* Support Xcode 9

* Commentary

Cut version 2.8.1

Correct attributes lookup for supplementary elements. (TextureGroup#1318

)

Correct attributes lookup for supplementary elements. (TextureGroup#1318

)

[Updated Snapshots] Don't add extraneous truncation token during kCTL…

…ineTruncationMiddle (TextureGroup#1375)

* Don't add extraneous truncation token during kCTLineTruncationMiddle

* Expand these comments a little.

* Update snapshot tests with beautiful correct behavior

Fix duplicate definition of category "YogaDebugging" (TextureGroup#1331)

Wrap supplementary node blocks to enable resizing them. (TextureGroup…

…#1265)

* Wrap supplementary node blocks to enable resizing them.

Most ASCellNodeBlocks are wrapped by ASCollectionView.mm to add an `interactionDelegate` as well as calling `enterHierarchyState` on the node and setting its transform to a reflection if `inverted` is set on the collectionView.

This PR adds this behavior to supplementary nodes as well.

* Simplify code / block will never be nil

Move AS_TEXT_ALERT_UNIMPLEMENTED_FEATURE into ASTextNodeCommon (Textu…

…reGroup#1191)