* Update to Xcode 15
## Summary
We want to make Texture build with recent tools like Xcode 15. Part of this is bumping the minimum supported OS to iOS 14.
I only removed the dead code (i.e. code gated on versions older than iOS 14). There are still some warnings about outdated APIs in use, but they are non-trivial changes to fix.
## Test plan
Run all the examples. Run all the unit tests and make them pass.
* Use Xcode 15.3 so we have 17.4 simulators
* Fixing an asset catalog compiler error when building against iPhone SE
* Fix a couple of file extensions for assets
A couple of PNGs were marked as JPGs
* Renames AS_EXTERN and ASViewController
To ASDK_EXTERN and ASDKViewController.
This is to avoid conflicting with AuthenticationServices in
Xcode 12
* Fix up examples and docs
* Add bit about updating ASViewController rename
- UIUserInterfaceLevel was added to ASTraitCollection in #1568. However, it's unavailable on tvOS and thus broke our podspec linting CI job. Fix by only include it if the build target is iOS.
- Fix availability warnings for usage of userInterfaceLevel
- Deprecate `asyncTraitCollectionDidChange` in favor of the new method
- Remove old compiler warning flag added for Xcode 9 building
- Access `textColorFollowsTintColor` with a locked scope
With the changes to `ASPrimitiveTraitCollection` in https://github.com/TextureGroup/Texture/commit/e392f832f42897da41a7c0106709b55427efcea4 a new `ASPrimitiveTraitCollectionMakeDefault` was created. The new method didn’t give all values in an `ASPrimitiveTraitCollection` a default value (or initialize the struct with `{}`). This was causing fields like `userInterfaceIdiom`, `forceTouchCapability`, and `displayScale` to be filled with garbage, leading to `ASPrimitiveTraitCollectionIsEqualToASPrimitiveTraitCollection` to return `YES` when the trait collection hadn’t really changed.
It also looks like the getter `containerSize` was not implemented.
* 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